GitHub - JamesType/Play-Leetcode: My Solutions to Leetcode problems. All solutions support C language, some support Java and Python. Multiple solutions will be given by most problems. Enjoy:) 我的Leetcode解答。所有的问题都支持C 语言，一部分问题支持Java语言。近乎所有问题都会提供多个算法解决。大家加油！：）

My solutions to Leetcode

I will put my solutions to Leetcode Problems in this repo. Every problem will be solved in C ; part of the problems will be solved in Java also. I will try my best to support more language in the future :)

Please feel free to contact me if you have any questions with this repo:)

email: [email protected]

大家好，欢迎大家来到我的 Leetcode 算法题解代码仓。在这个代码仓中，近乎每一个问题都会使用多种方式进行解决，同时标注了简明的算法思想，时间复杂度和空间复杂度。所有问题都会使用C 进行解决，各别问题支持Java语言和Python语言。

如果对代码仓有任何问题，欢迎联系我：）

电子邮件：[email protected]

知乎: 刘宇波 http://www.zhihu.com/people/liuyubobobo

知乎专栏：是不是很酷 https://zhuanlan.zhihu.com/liuyubobobo

个人公众号：是不是很酷：）

知识星球（免费）

其他相关代码仓

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《看得见的算法》课程, 代码仓: Play-with-Algorithm-Visualization
《玩转数据结构》课程, 代码仓: Play-with-Data-Structures
《玩转图论算法》课程, 代码仓: Play-with-Graph-Algorithms
LeetCode Database 题解代码仓：Play Leetcode Database

Problems

ID	Problem	Official Solution	C	Java	Python
001	Two Sum	solution	C	Java
002	Add Two Numbers	solution	C
003	Longest Substring Without Repeating Characters	solution	C	Java
004	Median of Two Sorted Arrays	solution	C	Java
005	Longest Palindromic Substring	solution	C
006	Zigzag Conversion	solution	C
007	Reverse Integer	solution	C
008	String to Integer (atoi)	solution	C

010	Regular Expression Matching	solution	C
011	Container With Most Water	solution	C
012	Integer to Roman	[无]	C
013	Roman to Integer	[无]	C
014	Longest Common Prefix	[无]	C
015	3Sum	[无]	C
016	3Sum Closest	[无]	C
017	Letter Combinations of a Phone Number	solution	C	Java
018	4Sum	[无]	C
019	Remove Nth Node From End of List	solution	C	Java
020	Valid Parentheses	solution	C	Java
021	Merge Two Sorted Lists	solution	C
022	Generate Parentheses	solution	C	Java	Python
023	Merge k Sorted Lists	solution	C
024	Swap Nodes in Pairs	[无]	C	Java
025	Reverse Nodes in k-Group	[无]	C
026	Remove Duplicates from Sorted Array	solution	C
027	Remove Element	solution	C
028	Implement strStr()	[无] [缺：完整BM算法, 其他模式匹配算法]	C
029	Divide Two Integers	solution [缺：不使用乘法加法除法]	C
030	Substring with Concatenation of All Words	solution	C
031	Next Permutation	solution	C

033	Search in Rotated Sorted Array	solution	C
034	Search for a Range	solution	C
035	Search Insert Position	solution	C
036	Valid Sudoku	solution	C
037	Sudoku Solver	solution [缺：Dancing Links]	C	C
038	Count and Say	[无]	C
039	Combination Sum	[无]	C
040	Combination Sum II	[无]	C
041	First Missing Positive	solution	C
042	Trapping Rain Water	solution	C
043	Multiply Strings	solution	C

045	Jump Game II	solution	C
046	Permutations	solution [缺：排列算法整理]	C	Java
047	Permutations II	[无]	C
048	Rotate Image	solution	C
049	Group Anagrams	solution	C
050	Pow(x, n)	[无]	C
051	N-Queens	[缺：N皇后问题整理]	C	Java
052	N-Queens II	solution [缺：N皇后问题整理]	C
053	Maximum Subarray	solution	C
054	Spiral Matrix	solution	C
055	Jump Game	solution	C
056	Merge Intervals	solution	C
057	Insert Interval	solution	C
058	Length of Last Word	solution	C
059	Spiral Matrix II	[无]	C

061	Rotate List	solution	C
062	Unique Paths	[无] [缺：数学解]	C
063	Unique Paths II	solution	C
064	Minimum Path Sum	solution	C	Java	Python
065	Valid Number	solution	C
066	Plus One	[无]	C
067	Add Binary	[无]	C
068	Text Justification	[无]	C
069	Sqrt(x)	[无]	C
070	Climbing Stairs	solution	C	Java
071	Simplify Path	[无]	C
072	Edit Distance	solution	C
073	Set Matrix Zeroes	solution	C
074	Search a 2D Matrix	[无]	C
075	Sort Colors	solution	C	Java	Python
076	Minimum Window Substring	solution	C
077	Combinations	solution	C	Java
078	Subsets	solution	C
079	Word Search	[无]	C	Java
080	Remove Duplicates from Sorted Array II	[无]	C
081	Search in Rotated Sorted Array II	solution	C
082	Remove Duplicates from Sorted List II	[无]	C
083	Remove Duplicates from Sorted List	[无]	C
084	Largest Rectangle in Histogram	solution 题解	C
085	Maximal Rectangle	solution	C
086	Partition List	solution	C
087	Scramble String	[无]	C
088	Merge Sorted Array	solution	C	Java
089	Gray Code	[无]	C
090	Subsets II	[无]	C
091	Decode Ways	[无]	C
092	Reverse Linked List II	solution	C
093	Restore IP Addresses	solution	C
094	Binary Tree Inorder Traversal	solution	C	Java
095	Unique Binary Search Trees II	solution	C
096	Unique Binary Search Trees	solution	C
097	Interleaving String	solution [缺：DP]	C
098	Validate Binary Search Tree	solution	C	Java
099	Recover Binary Search Tree	[无]		Java
100	Same Tree	solution	C
101	Symmetric Tree	solution	C		Python
102	Binary Tree Level Order Traversal	solution	C	Java
103	Binary Tree Zigzag Level Order Traversal	[无]	C
104	Maximum Depth of Binary Tree	solution	C	Java
105	Construct Binary Tree from Preorder and Inorder Traversal	solution	C
106	Construct Binary Tree from Inorder and Postorder Traversal	[无]	C
107	Binary Tree Level Order Traversal II	[无]	C
108	Convert Sorted Array to Binary Search Tree	[无]	C
109	Convert Sorted List to Binary Search Tree	solution	C
110	Balanced Binary Tree	solution	C
111	Minimum Depth of Binary Tree	solution	C
112	Path Sum	solution	C	Java
113	Path Sum II	[无]	C
114	Flatten Binary Tree to Linked List	solution	C
115	Distinct Subsequences	[无]	C	Java
116	Populating Next Right Pointers in Each Node	[无]	C
117	Populating Next Right Pointers in Each Node II	[无]	C
118	Pascal's Triangle	solution	C
119	Pascal's Triangle II	[无]	C
120	Triangle	[无]	C
121	Best Time to Buy and Sell Stock		C
122	Best Time to Buy and Sell Stock II	solution	C
123	Best Time to Buy and Sell Stock III		C
124	Binary Tree Maximum Path Sum	solution	C
125	Valid Palindrome	[无]	C
126	Word Ladder II	[无] [缺：双端搜索]	C
127	Word Ladder	solution	C	Java
128	Longest Consecutive Sequence		C
129	Sum Root to Leaf Numbers	[无]	C
130	Surrounded Regions	[无]	C
131	Palindrome Partitioning	solution [缺：DP]	C
132	Palindrome Partitioning II	[无]	C
133	Clone Graph	[无]	C
134	Gas Station	solution	C
135	Candy	solution [缺：O(1)空间算法]	C
136	Single Number	solution	C
137	Single Number II	solution	C
138	Copy List with Random Pointer	solution	C
139	Word Break	solution	C

141	Linked List Cycle	solution	C
142	Linked List Cycle II	solution	C
143	Reorder List	[无]	C
144	Binary Tree Preorder Traversal	solution	C	Java
145	Binary Tree Postorder Traversal	solution	C	Java
146	LRU Cache	solution [缺：封装一个Double Linked List]	C
147	Insertion Sort List	[无]	C
148	Sort List	[无]	C
149	Max Points on a Line	solution	C
150	Evaluate Reverse Polish Notation	[无]	C
151	Reverse Words in a String	[无]	C
152	Maximum Product Subarray	solution [缺：Linear]	C		Python
153	Find Minimum in Rotated Sorted Array	solution	C

155	Min Stack	[无]	C

159	Longest Substring with At Most Two Distinct Characters	solution	C
160	Intersection of Two Linked Lists	solution	C
161	One Edit Distance	solution	C
162	Find Peak Element	solution	C
163	Missing Ranges	solution	C
164	Maximum Gap	solution [缺：桶排序]	C
165	Compare Version Numbers	solution	C
166	Fraction to Recurring Decimal	solution	C
167	Two Sum II - Input array is sorted	solution	C	Java
168	Excel Sheet Column Title	[无]	C
169	Majority Element	solution	C		Python
170	Two Sum III - Data structure design	[无]	C
171	Excel Sheet Column Number	[无]	C
172	Factorial Trailing Zeroes	solution	C
173	Binary Search Tree Iterator	[无] [缺：Morris遍历]	C
174	Dungeon Game	solution	C
175	Database Problem: Link	-	-	-	-
176	Database Problem: Link	-	-	-	-

179	Largest Number	[无]	C

181	Database Problem: Link	-	-	-	-

184	Database Problem: Link	-	-	-	-

186	Reverse Words in a String II	[无]	C

188	Best-Time-to-Buy-and-Sell-Stock-IV		C
189	Rotate Array	solution	C
190	Reverse Bits	solution	C
191	Number of 1 Bits	solution	C

196	Database Problem: Link	-	-	-	-
197	Database Problem: Link	-	-	-	-
198	House Robber	solution	C	Java
199	Binary Tree Right Side View	solution	C
200	Number of Islands	solution	C	Java
201	Bitwise AND of Numbers Range	solution	C
202	Happy Number	solution	C
203	Remove Linked List Elements	[无]	C	Java
204	Count Primes	[无]	C
205	Isomorphic Strings	[无]	C
206	Reverse Linked List	solution	C	Java
207	Course Schedule	[无]	C
208	Implement Trie (Prefix Tree)	solution	C
209	Minimum Size Subarray Sum	solution	C	Java
210	Course Schedule II	solution	C
211	Add and Search Word - Data structure design	[无]	C	Java
212	Word Search II	[无]	C
213	House Robber II	[无]	C

215	Kth Largest Element in an Array	solution	C
216	Combination Sum III	[无]	C
217	Contains Duplicate	[无]	C
218	The Skyline Problem		C
219	Contains Duplicate II	solution	C	Java
220	Contains Duplicate III	solution	C	Java
221	Maximal Square	solution	C		Python
222	Count Complete Tree Nodes	[无]	C
223	Rectangle Area	[无]	C
224	Basic Calculator	[无]	C
225	Implement Stack using Queues	solution	C
226	Invert Binary Tree	solution	C	Java	Python
227	Basic Calculator II	[无]	C
228	Summary Ranges	solution	C
229	Majority Element II	solution [缺：BM Voting]	C
230	Kth Smallest Element in a BST	solution [缺：非递归]	C
231	Power of Two	solution	C
232	Implement Queue using Stacks	solution	C
233	Number of Digit One	solution [缺：数学方法]	C
234	Palindrome Linked List	[无]	C
235	Lowest Common Ancestor of a Binary Search Tree	solution	C	Java
236	Lowest Common Ancestor of a Binary Tree	solution [缺：非递归解法；LCA问题总结]	C
237	Delete Node in a Linked List	solution	C	Java
238	Product of Array Except Self	solution	C		Python
239	Sliding Window Maximum	solution	C
240	Search a 2D Matrix II	solution [缺：分治]	C
241	Different Ways to Add Parentheses	[无]	C
242	Valid Anagram	solution	C
243	Shortest Word Distance	solution	C
244	Shortest Word Distance II	solution	C
245	Shortest Word Distance III	[无]	C
246	Strobogrammatic Number	solution	C
247	Strobogrammatic Number II	[无]	C
248	Strobogrammatic Number III	[无]	C
249	Group Shifted Strings	[无]	C
250	Count Univalue Subtrees	solution	C
251	Flatten 2D Vector	solution	C
252	Meeting Rooms	solution	C
253	Meeting Rooms II	solution	C
254	Factor Combinations	[无]	C

256	Paint House	[无]	C
257	Binary Tree Paths	solution	C	Java
258	Add Digits	solution	C
259	3Sum Smaller	solution	C
260	Single Number III	solution	C
261	Graph Valid Tree	C

263	Ugly Number	[无]	C
264	Ugly Number II	solution	C
265	Paint House II	C
266	Palindrome Permutation	solution	C
267	Palindrome Permutation II	solution	C
268	Missing Number	solution	C
269	Alien Dictionary	solution	C

273	Integer to English Words	solution	C
274	H-Index	solution [缺：非二分]	C
275	H-Index II	solution	C
276	Paint Fence	solution	C
277	Find the Celebrity	solution [缺：O(n) 解法]	C
278	First Bad Version	solution	C
279	Perfect Squares	[无] 四平方和数学解	C	Java
280	Wiggle Sort	solution	C

282	Expression Add Operators	solution	C
283	Move Zeroes	solution	C	Java
284	Peeking Iterator	solution	C
285	Inorder Successor in BST	[无] [缺：空间O(h)]	C
286	Walls and Gates	solution	C
287	Find the Duplicate Number		C
288	Unique Word Abbreviation	solution	C
289	Game of Life	solution	C
290	Word Pattern	[无]	C

292	Nim Game	solution	C

295	Find Median from Data Stream	[无]	C
296	Best Meeting Point	solution	C
297	Serialize and Deserialize Binary Tree	solution	C
298	Binary Tree Longest Consecutive Sequence	solution	C
299	Bulls and Cows	solution	C
300	Longest Increasing Subsequence	solution	C	Java
301	0301-Remove-Invalid-Parentheses	solution [缺：DP 构建]	C

303	Range Sum Query - Immutable		C
304	Range Sum Query 2D - Immutable	solution	C
305	Number of Islands II	solution	C
306	Additive Number	[无]	C
307	Range Sum Query - Mutable	[缺：BIT]	C
308	Range Sum Query 2D - Mutable		C
309	Best Time to Buy and Sell Stock with Cooldown	solution	C
310	Minimum Height Trees	solution	C
311	Sparse Matrix Multiplication	[无]	C
312	Burst Balloons	solution 题解	C
313	Super Ugly Number	[无]	C
314	Binary Tree Vertical Order Traversal	[无]	C
315	Count of Smaller Numbers After Self	[无]	C
316	Remove Duplicate Letters	solution	C
317	Shortest Distance from All Buildings	solution	C
318	Maximum Product of Word Lengths	solution	C
319	Bulb Switcher	[无]	C

321	Create Maximum Number	[无]	C
322	Coin Change	solution	C
323	Number of Connected Components in an Undirected Graph	solution	C
324	Wiggle Sort II	[无]	C
325	Maximum Size Subarray Sum Equals k	solution	C
326	Power of Three	solution	C

328	Odd Even Linked List	solution	C
329	Longest Increasing Path in a Matrix	solution	C
330	Patching Array	[无]	C
331	Verify Preorder Serialization of a Binary Tree	solution	C
332	Reconstruct Itinerary	solution	C

334	Increasing Triplet Subsequence	solution	C
335	Self Crossing	[无]	C
336	Palindrome Pairs	solution	C
337	House Robber III	[无]	C
338	Counting Bits	solution	C
339	Nested List Weight Sum	[无]	C
340	Longest Substring with At Most K Distinct Characters	solution	C
341	Flatten Nested List Iterator	[无]	C
342	Power of Four	solution	C
343	Integer Break	[无]	C	Java
344	Reverse String	[无]	C
345	Reverse Vowels of a String	[无]	C
346	Moving Average from Data Stream	[无]	C
347	Top K Frequent Elements	solution	C	Java
348	Find Winner on a Tic Tac Toe Game	[无]	C
349	Intersection of Two Arrays	solution	C	Java
350	Intersection of Two Arrays II	[无]	C	Java

352	Data Stream as Disjoint Intervals	[无]	C

354	Russian Doll Envelopes	solution	C

357	Count Numbers with Unique Digits	[无]	C

359	Logger Rate Limiter	[无]	C
360	Sort Transformed Array	[无]	C

362	Design Hit Counter	[无]	C
363	Max Sum of Rectangle No Larger Than K	[无]	C
364	Nested List Weight Sum II	[无]	C
365	Water and Jug Problem	题解 [缺：数学解法]	C
366	Find Leaves of Binary Tree	solution	C
367	Valid Perfect Square	solution	C
368	Largest Divisible Subset	solution	C
369	Plus One Linked List	solution	C
370	Range Addition		C

372	Super Pow	[无]	C
373	Find K Pairs with Smallest Sums	[无]	C
374	Guess Number Higher or Lower	solution	C
375	Guess Number Higher or Lower II	[无]	C
376	Wiggle Subsequence	solution	C [缺：DP；O(1) 空间贪心]
377	Combination Sum IV	[无]	C
378	Kth Smallest Element in a Sorted Matrix	[无]	C

380	Insert Delete GetRandom O(1)	[无]	C
381	Insert Delete GetRandom O(1) - Duplicates allowed	[无]	C
382	Linked List Random Node	[无]	C
383	Ransom Note	solution	C
384	Shuffle an Array	solution	C
385	Mini Parser	[无]	C
386	Lexicographical Numbers		C
387	First Unique Character in a String	solution	C	Java
388	Longest Absolute File Path		C
389	Find the Difference		C
390	Elimination Game		C
391	Perfect Rectangle	[缺：矩形求交]	C
392	Is Subsequence	[无]	C
393	UTF-8 Validation	solution	C
394	Decode String	[无]	C
395	Longest Substring with At Least K Repeating Characters	solution [缺：滑动窗口]	C
396	Rotate Function	[无]	C
397	Integer Replacement	[无]	C
398	Random Pick Index	[无]	C
399	Evaluate Division	solution [缺：UF]	C
400	Nth Digit	[无]	C
401	Binary Watch	[无]	C
402	Remove K Digits	solution 题解	C
403	Frog Jump	solution [缺：dp]	C
404	Sum of Left Leaves	[无]	C
405	Convert a Number to Hexadecimal	[无]	C
406	Queue Reconstruction by Height	[无]	C
407	Trapping Rain Water II	[无]	C

410	Split Array Largest Sum	solution 题解	C

412	Fizz Buzz	solution	C
413	Arithmetic Slices	solution	C
414	Third Maximum Number	[无]	C
415	Add Strings	solution	C
416	Partition Equal Subset Sum	[无]	C	Java
417	Pacific Atlantic Water Flow		C	Java

419	Battleships in a Board	[无]	C
420	Strong Password Checker	[无]	C
421	Maximum XOR of Two Numbers in an Array	solution	C
422	Valid Word Square	[无]	C
423	Reconstruct Original Digits from English	solution	C
424	Longest Repeating Character Replacement	[无]	C

426	Convert Binary Search Tree to Sorted Doubly Linked List	solution	C
427	Construct Quad Tree	[无]	C

429	N-ary Tree Level Order Traversal	[无]	C
430	Flatten a Multilevel Doubly Linked List	[无]	C
431	Encode N-ary Tree to Binary Tree	solution	C
432	All O one Data Structure	[无] [缺：O(1)]	C
433	Minimum Genetic Mutation	[无]	C
434	Number of Segments in a String	[无]	C
435	Non-overlapping Intervals	solution	C	Java
436	Find Right Interval	[无]	C
437	Path Sum III	[无]	C	Java
438	Find All Anagrams in a String	[无]	C
439	Ternary Expression Parser	[无]	C
440	K-th Smallest in Lexicographical Order	[无] [缺：更简单的实现]	C
441	Arranging Coins	solution	C
442	Find All Duplicates in an Array	solution	C
443	String Compression		C
444	Sequence Reconstruction	[无]	C
445	Add Two Numbers II	[无]	C
446	Arithmetic Slices II - Subsequence	solution	C
447	Number of Boomerangs	[无]	C	Java
448	Find All Numbers Disappeared in an Array	solution	C
449	Serialize and Deserialize BST	solution	C
450	Delete Node in a BST	solution	C
451	Sort Characters By Frequency	[无]	C	Java
452	Minimum Number of Arrows to Burst Balloons	solution	C
453	Minimum Moves to Equal Array Elements	solution	C
454	4Sum II	[无]	C	Java
455	Assign Cookies	[无]	C	Java
456	132 Pattern	solution [缺：O(n) 单调栈算法]	C
457	Circular Array Loop	[无]	C
458	Poor Pigs	solution	C
459	Repeated Substring Pattern	[无]	C
460	LFU Cache	solution	C
461	Hamming Distance	solution	C
462	Minimum Moves to Equal Array Elements II	solution	C
463	Island Perimeter	solution	C
464	Can I Win	[无]	C

467	Unique Substrings in Wraparound String	[无]	C
468	Validate IP Address	[无]	C

470	Implement Rand10() Using Rand7()	solution	C

472	Concatenated Words	[无]	C
473	Matchsticks to Square	solution	C
474	Ones and Zeroes	solution	C
475	Heaters	[无]	C
476	Number Complement	solution	C
477	Total Hamming Distance	solution 题解	C
478	Generate Random Point in a Circle	solution	C
479	Largest Palindrome Product	[无]	C
480	Sliding Window Median	[无] [缺：双数据结构]	C
481	Magical String	[无]	C
482	License Key Formatting	[无]	C
483	Smallest Good Base	[无]	C
484	Find Permutation	solution	C
485	Max Consecutive Ones	[无]	C
486	Predict the Winner	[无]	C
487	Max Consecutive Ones II	[无]	C
488	Zuma Game	[无]	C
489	Robot Room Cleaner	solution	C
490	The Maze	solution	C
491	Non-decreasing Subsequences	[无]	C
492	Construct the Rectangle	[无]	C

494	Target Sum	solution	C
495	Teemo Attacking	solution	C
496	Next Greater Element I	solution	C
497	Random Point in Non-overlapping Rectangles	solution	C
498	Diagonal Traverse	[无]	C

500	Keyboard Row	[无]	C
501	Find Mode in Binary Search Tree	[无]	C
502	IPO	solution	C
503	Next Greater Element II	solution	C
504	Base 7	[无]	C
505	The Maze II	solution	C
506	Relative Ranks	[无]	C
507	Perfect Number	solution	C
508	Most Frequent Subtree Sum	[无]	C
509	Fibonacci Number	[无]	C
510	Inorder Successor in BST II	[无]	C
511	Database Problem: Link	-	-	-	-

513	Find Bottom Left Tree Value	[无]	C

515	Find Largest Value in Each Tree Row	[无]	C
516	Longest Palindromic Subsequence	[无]	C
517	Super Washing Machines	solution	C
518	Coin Change 2	[无]	C
519	Random Flip Matrix	solution	C
520	Detect Capital	solution	C
521	Longest Uncommon Subsequence I	solution	C
522	Longest Uncommon Subsequence II	solution	C
523	Continuous Subarray Sum	[无]	C
524	Longest Word in Dictionary through Deleting	solution	C
525	Contiguous Array	solution 题解	C
526	Beautiful Arrangement	solution	C
527	Word Abbreviation	solution	C
528	Random Pick with Weight	solution	C
529	Minesweeper	[无]	C
530	Minimum Absolute Difference in BST	[无]		Java
531	Lonely Pixel I	[无]	C
532	K-diff Pairs in an Array	solution	C
533	Lonely Pixel II	[无]	C

536	Construct Binary Tree from String	solution [缺：stack]	C
537	Complex Number Multiplication	solution	C
538	Convert BST to Greater Tree	solution	C
539	Minimum Time Difference	[无]	C
540	Single Element in a Sorted Array	solution	C
541	Reverse String II	solution	C
542	01 Matrix	solution	C
543	Diameter of Binary Tree	solution	C

546	Remove Boxes	solution	C
547	Number of Provinces	solution	C

549	Binary Tree Longest Consecutive Sequence II	solution	C

551	Student Attendance Record I	solution	C
552	Student Attendance Record II	solution	C
553	Optimal Division	solution [缺：O(n) 解法]	C
554	Brick Wall	solution	C

556	Next Greater Element III	solution [缺：底层实现]	C
557	Reverse Words in a String III	solution	C
558	Logical OR of Two Binary Grids Represented as Quad-Trees	[无]	C
559	Maximum Depth of N-ary Tree	solution	C
560	Subarray Sum Equals K	solution	C
561	Array Partition I	solution	C

563	Binary Tree Tilt	solution	C
564	Find the Closest Palindrome	[无]	C
565	Array Nesting	solution	C
566	Reshape the Matrix	solution	C
567	Permutation in String	solution 题解	C

570	Database Problem: Link	-	-	-	-

572	Subtree of Another Tree	solution	C
573	Squirrel Simulation	solution	C

575	Distribute Candies	solution	C
576	Out of Boundary Paths	solution	C

580	Database Problem: Link	-	-	-	-
581	Shortest Unsorted Continuous Subarray	solution [缺：Stack]	C
582	Kill Process	solution	C
583	Delete Operation for Two Strings	solution	C
584	Database Problem: Link	-	-	-	-

586	Database Problem: Link	-	-	-	-
587	Erect the Fence	solution 题解 [缺：凸包解法整理]	C

589	N-ary Tree Preorder Traversal	solution	C
590	N-ary Tree Postorder Transversal	solution	C
591	Tag Validator	solution	C
592	Fraction Addition and Subtraction	[无]	C
593	Valid Square	solution	C
863	Longest Harmonious Subsequence	solution	C
595	Database Problem: Link	-	-	-	-

598	Range Addition II		C
599	Minimum Index Sum of Two Lists	solution	C
600	Non-negative Integers without Consecutive Ones	solution [缺：Bit Manipulation]	C

605	Can Place Flowers	solution	C
606	Construct String from Binary Tree	solution	C
607	Database Problem: Link	-	-	-	-
608	Database Problem: Link	-	-	-	-
609	Find Duplicate File in System	solution	C

611	Valid Triangle Number	solution	C

617	Merge Two Binary Trees	C

619	Database Problem: Link	-	-	-	-

621	Task Scheduler	solution	C
622	Design Circular Queue	[无]	C
623	Add One Row to Tree	solution	C

627	Database Problem: Link	-	-	-	-
628	Maximum Product of Three Numbers	solution	C
629	K-Inverse-Pairs-Array	solution [缺：其他 dp 优化思路]	C
630	Course Schedule III	solution	C

632	Smallest Range Covering Elements from K Lists	solution	C
633	Sum of Square Numbers	C

636	Exclusive Time of Functions	[无]	C
637	Average of Levels in Binary Tree	solution	C
638	Shopping Offers	solution	C
639	Decode Ways II	solution [缺：DP]	C
640	Solve the Equation	[无]	C

642	Design Search Autocomplete System	[无]	C
643	Maximum Average Subarray I	solution	C
644	Maximum Average Subarray II	solution	C
645	Set Mismatch	solution [缺：空间 O(1) 解法]	C
646	Maximum Length of Pair Chain	solution	C
647	Palindromic Substrings	solution	C
648	Replace Words	[无]	C
649	Dota2 Senate	solution [缺：队列]	C
650	2 Keys Keyboard	solution	C

652	Find Duplicate Subtrees	solution	C
653	Two Sum IV - Input is a BST	[无]	C
654	Maximum Binary Tree	solution	C
655		Print Binary Tree	[无]	C

658	Find K Closest Elements	solution [缺：二分]	C
659	Split Array into Consecutive Subsequences	solution	C

661	Image Smoother	[无]	C
662	Maximum Width of Binary Tree	solution	C

664	Strange Printer	solution	C
665	Non-decreasing Array	solution	C
666	Path Sum IV	solution	C
667	Beautiful Arrangement II	solution	C
668	Kth Smallest Number in Multiplication Table	solution	C
669	Trim a Binary Search Tree	solution	C
670	Maximum Swap	[无]	C
671	Second Minimum Node In a Binary Tree	solution	C
672	Bulb Switcher II	solution	C
673	Number of Longest Increasing Subsequence	[缺：BIT；线段树]	C
674	Longest Continuous Increasing Subsequence		C
675	Cut Off Trees for Golf Event	[缺：A*；Hadlock's Algo]	C
676	Implement Magic Dictionary	solution	C
677	Map Sum Pairs	solution	C
678	Valid Parenthesis String	solution	C
679	24 Game	solution	C
680	Valid Palindrome II	[无]	C

682	Baseball Game	solution	C

684	Redundant Connection	solution	C
685	Redundant Connection II	solution	C
686	Repeated String Match	[无]	C
687	Longest Univalue Path	solution	C
688	Knight Probability in Chessboard	solution	C
689	Maximum Sum of 3 Non-Overlapping Subarrays	solution	C
690	Employee Importance	solution	C
691	Stickers to Spell Word	[无]	C
692	Top K Frequent Words	solution	C
693	Binary Number with Alternating Bits	[无]	C
694	Number of Distinct Islands	[review: hash的方式]	C
695	Max-Area-of-Island		C
696	Count Binary Substrings		C
697	Degree of an Array		C
698	Partition to K Equal Sum Subsets		C	Java
699	Falling Squares	[缺：线段树；块状链表]	C
700	Search in a Binary Search Tree	solution	C
701	Insert into a Binary Search Tree	solution	C

703	Kth Largest Element in a Stream	[无]	C
704	Binary Search	solution	C
705	Design HashSet	[无]	C
706	Design HashMap	[无]	C
707	Design Linked List	[无]	C
708	Insert into a Cyclic Sorted List	[无]	C
709	To Lower Case	solution	C
710	Random Pick with Blacklist	solution	C
711	Number of Distinct Islands II	[review: hash的方式]	C
712	Minimum ASCII Delete Sum for Two Strings		C
713	Subarray Product Less Than K		C
714	Best Time to Buy and Sell Stock with Transaction Fee		C
715	Range Module	[缺：set查找]	C
716	Max Stack	solution	C
717	1-bit and 2-bit Characters		C
718	Maximum Length of Repeated Subarray	[缺：Rolling Hash]	C
719	Find K-th Smallest Pair Distance	solution	C
720	Longest Word in Dictionary	solution	C
721	Accounts Merge	solution	C
722	Remove Comments	solution	C
723	Candy Crush	solution	C
724	Find Pivot Index	solution	C
725	Split Linked List in Parts	solution	C
726	Number of Atoms	solution	C
727	Minimum Window Subsequence	solution	C
728	Self Dividing Numbers	solution	C
729	My Calendar I	solution	C
730	Count Different Palindromic Subsequences	[无]	C
731	My Calendar II	solution	C
732	My Calendar III	solution	C
733	Flood Fill	solution	C
734	Sentence Similarity	solution	C
735	Asteroid Collision	solution	C
736	Parse Lisp Expression	solution	C
737	Sentence Similarity II	solution	C

739	Daily Temperatures	solution	C
740	Delete and Earn	solution	C
741	Cherry Pickup	solution [缺：自底向上的动态规划]	C

745	Prefix and Suffix Search	solution	C
746	Min Cost Climbing Stairs	solution	C
747	Largest Number At Least Twice of Others	solution	C

749	Contain Virus	[无]	C

752	Open the Lock	solution	C
753	Cracking the Safe	[无]	C
754	Reach a Number	Solution	C

757	Set Intersection Size At Least Two	[无]	C

761	Special Binary String	solution	C
762	Prime Number of Set Bits in Binary Representation	[无]	C
763	Partition Labels	[无]	C
764	Largest Plus Sign	C
765	Couples Holding Hands	solution	C
766	Toeplitz Matrix	solution	C

771	Jewels and Stones	solution	C
772	Basic Calculator III	[无]	C

774	Minimize Max Distance to Gas Station	solution	C
775	Global and Local Inversions	C

779	K-th Symbol in Grammar	[无]	C
780	Reaching Points	solution	C
781	Rabbits in Forest	solution	C
782	Transform to Chessboard	solution	C
783	Minimum Distance Between BST Nodes	solution	C
784	Letter Case Permutation	solution	C
785	Is Graph Bipartite?	solution	C
786	K-th Smallest Prime Fraction	solution [缺：分治算法]	C
787	Cheapest Flights Within K Stops	solution [缺：使用Heap]	C
788	Rotated Digits	solution	C
789	Escape The Ghosts	solution	C
790	Domino and Tromino Tiling	solution [缺：转移矩阵求幂解法]	C
791	Custom Sort String	solution	C
792	Number of Matching Subsequences	solution	C
793	Preimage Size of Factorial Zeroes Function	solution	C
794	Valid Tic-Tac-Toe State	solution	C
795	Number of Subarrays with Bounded Maximum	solution	C
796	Rotate String	solution [缺：Rolling Hash]	C
797	All Paths From Source to Target	solution	C
798	Smallest Rotation with Highest Score	solution [缺：O(n) 解法]	C
799	Champagne Tower	solution	C
800	Similar RGB Color	solution	C

802	Find Eventual Safe States	solution	C
803	Bricks Falling When Hit	[无]	C
804	Unique Morse Code Words	solution	C
805	Split Array With Same Average	solution	C
806	Number of Lines To Write String	solution	C
807	Max Increase to Keep City Skyline	solution	C

809	Expressive Words	solution	C
810	Chalkboard XOR Game	solution	C
811	Subdomain Visit Count	solution	C

813	Largest Sum of Averages	solution	C
814	Binary Tree Pruning	solution	C
815	Bus Routes	solution	C

817	Linked List Components	solution	C

819	Most Common Word	solution	C

822	Card Flipping Game	[无]	C
823	Binary Trees With Factors	solution	C
824	Goat Latin	[无]	C
825	Friends Of Appropriate Ages	[无]	C

827	Making A Large Island	[无]	C
828	Count Unique Characters of All Substrings of a Given String	[无]	C
829	Consecutive Numbers Sum	[无]	C
830	Positions of Large Groups	solution	C
831	Masking Personal Information	[无]	C
832	Flipping an Image	solution	C
833	Find And Replace in String	[无]	C
834	Sum of Distances in Tree	solution	C
835	Image Overlap	[无]	C

837	New 21 Game	[无]	C
838	Push Dominoes	solution	C
839	Similar String Groups	solution
C

841	Keys and Rooms	solution	C
842	Split Array into Fibonacci Sequence	solution	C

844	Backspace String Compare	solution	C

846	Hand of Straights	[无]	C
847	Shortest Path Visiting All Nodes	[无]	C
848	Shifting Letters	[无]	C
849	Maximize Distance to Closest Person	[无]	C
850	Rectangle Area II	solution	C
851	Loud and Rich	solution	C
852	Peak Index in a Mountain Array	solution	C
853	Car Fleet	solution	C
854	K-Similar Strings	solution	C
855	Exam Room	solution	C
856	Score of Parentheses	solution	C
857	Minimum Cost to Hire K Workers	solution [缺：二分搜索]	C
858	Mirror Reflection	solution	C
859	Buddy Strings	solution	C
860	Lemonade Change	solution	C
861	Score After Flipping Matrix	solution	C

863	All Nodes Distance K in Binary Tree	solution	C
864	Shortest Path to Get All Keys	solution [缺：Dijkstra]	C
865	Smallest Subtree with all the Deepest Nodes	solution	C
866	Prime Palindrome	solution	C
867	Transpose Matrix	solution	C
868	Binary Gap	solution	C
869	Reordered Power of 2	solution	C
870	Advantage Shuffle	solution	C
871	Minimum Number of Refueling Stops	solution 题解	C
872	Leaf-Similar Trees	solution	C
873	Length of Longest Fibonacci Subsequence	solution	C
874	Walking-Robot-Simulation	solution	C
875	Koko Eating Bananas	solution	C
876	Middle of the Linked List	solution	C
877	Stone Game	solution	C
878	Nth Magical Number	solution	C
879	Profitable Schemes	solution	C
880	Decoded String at Index	solution	C
881	Boats to Save People	solution	C
882	Reachable Nodes In Subdivided Graph	solution	C
883	Projection Area of 3D Shapes	solution	C
884	Uncommon Words from Two Sentences	solution	C
885	Spiral Matrix III	solution	C
886	Possible Bipartition	solution	C

888	Fair Candy Swap	solution	C
889	Construct Binary Tree from Preorder and Postorder Traversal	solution	C
890	Find and Replace Pattern	solution	C
891	Sum of Subsequence Widths	solution	C
892	Surface Area of 3D Shapes	solution	C
893	Groups of Special-Equivalent Strings	solution	C
894	All Possible Full Binary Trees	solution	C
895	Maximum Frequency Stack	solution	C
896	Monotonic Array	solution	C		Python
897	Increasing Order Search Tree	solution	C
898	Bitwise ORs of Subarrays	solution	C
899	Orderly Queue	solution	C
900	RLE Iterator	solution	C
901	Online Stock Span	solution	C
902	Numbers At Most N Given Digit Set	solution	C
903	Valid Permutations for DI Sequence	solution [缺：O(n^2) DP]	C
904	Fruit Into Baskets	solution	C
905	Sort Array By Parity	solution	C
906	Super Palindromes	solution	C
907	Sum of Subarray Minimums	solution	C
908	Smallest Range I	solution	C
909	Snakes and Ladders	solution	C
910	Smallest Range II	solution	C
911	Online Election	solution	C
912	Sort an Array	[无]	C
913	Cat and Mouse Game	solution [缺：DFS拓扑排序；DP]	C
914	X of a Kind in a Deck of Cards	solution	C
915	Partition Array into Disjoint Intervals	solution	C
916	Word Subsets	solution	C
917	Reverse Only Letters	solution	C
918	Maximum Sum Circular Subarray	solution	C
919	Complete Binary Tree Inserter	solution	C
920	Number of Music Playlists	solution [缺：生成函数]	C
921	Minimum Add to Make Parentheses Valid	solution	C
922	Sort Array By Parity II	solution	C
923	3Sum With Multiplicity	solution	C
924	Minimize Malware Spread	solution	C
925	Long Pressed Name	solution	C
926	Flip String to Monotone Increasing	solution	C
927	Three Equal Parts	solution	C
928	Minimize Malware Spread II	solution	C
929	Unique Email Addresses	solution	C
930	Binary Subarrays With Sum	solution	C
931	Minimum Path Falling Sum	solution	C
932	Beautiful Array	solution	C
933	Number of Recent Calls	solution	C
934	Shortest Bridge	solution	C
935	Knight Dialer	solution	C
936	Stamping The Sequence	solution	C
937	Reorder Log Files	solution	C
938	Range Sum of BST	solution	C
939	Minimum Area Rectangle	solution	C
940	Distinct Subsequences II	solution	C
941	Valid Mountain Array	solution	C
942	DI String Match	solution	C
943	Find the Shortest Superstring	solution [缺：动态规划]	C
944	Delete Columns to Make Sorted	solution	C
945	Minimum Increment to Make Array Unique	solution	C
946	Validate Stack Sequences	solution	C
947	Most Stones Removed with Same Row or Column	solution	C
948	Bag of Tokens	solution	C
949	Largest Time for Given Digits	solution	C
950	Reveal Cards In Increasing Order	solution	C
951	Flip Equivalent Binary Trees	solution	C
952	Largest Component Size by Common Factor	solution	C
953	isAlienSorted	solution	C
954	Array of Doubled Pairs	solution	C
955	Delete Columns to Make Sorted II	solution	C
956	Tallest Billboard	solution	C
957	Prison Cells After N Days	solution	C
958	Check Completeness of a Binary Tree	solution	C
959	Regions Cut By Slashes	solution	C
960	Delete Columns to Make Sorted III	solution	C
961	N-Repeated Element in Size 2N Array	solution	C

965	Univalued Binary Tree	solution	C
966	Vowel Spellchecker	solution	C
967	Numbers With Same Consecutive Differences	solution	C
968	Binary Tree Cameras	solution	C
969	Pancake Sorting	solution	C
970	Powerful Integers	solution	C
971	Flip Binary Tree To Match Preorder Traversal	solution	C
972	Equal Rational Numbers	solution	C
973	K Closest Points to Origin	solution	C
974	Subarray Sums Divisible by K	solution	C
975	Odd Even Jump	solution	C
976	Largest Perimeter Triangle	solution	C
977	Squares of a Sorted Array	solution	C
978	Longest Turbulent Subarray	solution [缺：滑动窗口 & dp]	C
979	Distribute Coins in Binary Tree	solution	C
980	Unique Paths III	solution [缺：记忆化搜索]	C	Java
981	Time Based Key-Value Store	solution	C
982	Triples with Bitwise AND Equal To Zero	[无]	C
983	Minimum Cost For Tickets	solution	C
984	String Without AAA or BBB	solution	C
985	Sum of Even Numbers After Queries	solution	C
986	Interval List Intersections	solution	C
987	Vertical Order Traversal of a Binary Tree	solution	C
988	Smallest String Starting From Leaf	solution	C
989	Add to Array-Form of Integer	solution	C
990	Satisfiability of Equality Equations	solution	C
991	Broken Calculator	solution	C
992	Subarrays with K Different Integers	solution	C
993	Cousins in Binary Tree	solution	C
994	Rotting Oranges	solution	C
995	Minimum Number of K Consecutive Bit Flips	solution	C
996	Number of Squareful Arrays	solution	C
997	Find the Town Judge	[无]	C
998	Maximum Binary Tree II	[无]	C
999	Available Captures for Rook	[无]	C
1000	Minimum Cost to Merge Stones	[无]	C
1001	Grid Illumination	[无]	C
1002	Find Common Characters	[无]	C
1003	Check If Word Is Valid After Substitutions	[无]	C
1004	Max Consecutive Ones III	[无]	C
1005	Maximize Sum Of Array After K Negations	[无]	C
1006	Clumsy Factorial	[无]	C
1007	Minimum Domino Rotations For Equal Row	[无]	C
1008	Construct Binary Search Tree from Preorder Traversal	[无]	C
1009	Complement of Base 10 Integer	[无]	C
1010	Pairs of Songs With Total Durations Divisible by 60	[无]	C
1011	Capacity To Ship Packages Within D Days	[无]	C
1012	Numbers With 1 Repeated Digit	[无]	C
1013	Partition Array Into Three Parts With Equal Sum	[无]	C
1014	Best Sightseeing Pair	[无]	C
1015	Smallest Integer Divisible by K	[无]	C
1016	Binary String With Substrings Representing 1 To N	[无]	C
1017	Convert to Base -2	[无]	C
1018	Binary Prefix Divisible By 5	[无]	C
1019	Next Greater Node In Linked List	[无]	C
1020	Number of Enclaves	[无]	C
1021	Remove Outermost Parentheses	[无]	C
1022	Sum of Root To Leaf Binary Numbers	[无]	C
1023	Camelcase Matching	[无]	C
1024	Video Stitching	[无]	C
1025	Divisor Game	[无]	C
1026	Maximum Difference Between Node and Ancestor	[无]	C
1027	Longest Arithmetic Sequence	[无]	C
1028	Recover a Tree From Preorder Traversal	[无]	C
1029	Two City Scheduling	[无]	C
1030	Matrix Cells in Distance Order	[无]	C
1031	Maximum Sum of Two Non-Overlapping Subarrays	[无]	C
1032	Stream of Characters	[无]	C
1033	Moving Stones Until Consecutive	[无]	C
1034	Coloring A Border	[无]	C
1035	Uncrossed Lines	[无]	C
1036	Escape a Large Maze	[无]	C
1037	Valid Boomerang	[无]	C
1038	Binary Search Tree to Greater Sum Tree	[无]	C
1039	Minimum Score Triangulation of Polygon	[无]	C
1040	Moving Stones Until Consecutive II	[无]	C
1041	Robot Bounded In Circle	[无]	C
1042	Flower Planting With No Adjacent	[无]	C
1043	Partition Array for Maximum Sum	[无]	C
1044	Longest Duplicate Substring	[无] [缺：后缀数组]	C

1046	Last Stone Weight	[无]	C
1047	Remove All Adjacent Duplicates In String	[无]	C

1049	Last Stone Weight II	[无]	C
1050	Database Problem: Link	-	-	-	-
1051	Height Checker	[无]	C
1052	Grumpy Bookstore Owner	[无]	C
1053	Previous Permutation With One Swap	[无]	C
1054	Distant Barcodes	[无]	C
1055	Shortest Way to Form String	[无]	C
1056	Confusing Number	[无]	C

1059	All Paths from Source Lead to Destination	solution	C

1061	Lexicographically Smallest Equivalent String	[无]	C
1062	Longest Repeating Substring	[无]	C

1065	Index Pairs of a String	[无]	C
1066	Campus Bikes II	solution	C

1072	Flip Columns For Maximum Number of Equal Rows	[无]	C

1074	Number of Submatrices That Sum to Target	[无]	C

1078	Occurrences After Bigram	[无]	C
1079	Letter Tile Possibilities	[无]	C
1080	Insufficient Nodes in Root to Leaf Paths	[无]	C
1081	Smallest Subsequence of Distinct Characters	[无]	C

1084	Database Problem: Link	-	-	-	-

1087	Brace Expansion	[无]	C
1088	Confusing Number II	[无]	C
1089	Duplicate Zeros	[无]	C
1090	Largest Values From Labels	[无]	C
1091	Shortest Path in Binary Matrix	[无]	C
1092	Shortest Common Supersequence	[无]	C
1093	Statistics from a Large Sample	[无]	C
1094	Car Pooling	[无]	C
1095	Find in Mountain Array	[无]	C
1096	Brace Expansion II	[无] [缺：非递归算法]	C

1099	Two Sum Less Than K	[无]	C
1100	Find K-Length Substrings With No Repeated Characters	[无]	C
1101	The Earliest Moment When Everyone Become Friends	[无]	C
1102	Path With Maximum Minimum Value	[无] [缺：并查集]	C
1103	Distribute Candies to People	solution	C
1104	Path In Zigzag Labelled Binary Tree	[无]	C
1105	Filling Bookcase Shelves	[无]	C
1106	Parsing A Boolean Expression	[无] [缺：非递归算法]	C

1108	Defanging an IP Address	[无]	C
1109	Corporate Flight Bookings	[无]	C
1110	Delete Nodes And Return Forest	[无]	C
1111	Maximum Nesting Depth of Two Valid Parentheses Strings	[无]	C
1112	Database Problem: Link	-	-	-	-

1118	Number of Days in a Month	[无]	C
1119	Remove Vowels from a String	[无]	C
1120	Maximum Average Subtree	[无]	C
1121	Divide Array Into Increasing Sequences	[无]	C

1124	Longest Well-Performing Interval	[无]	C

1128	Number of Equivalent Domino Pairs	[无]	C
1129	Shortest Path with Alternating Colors	[无]	C
1130	Minimum Cost Tree From Leaf Values	[无]	C
1131	Maximum of Absolute Value Expression	[无]	C

1133	Largest Unique Number	[无]	C
1134	Armstrong Number	[无]	C
1135	Connecting Cities With Minimum Cost	[无]	C
1136	Parallel Courses	[无] [缺：后序遍历拓扑排序]	C
1137	N-th Tribonacci Number	[无]	C
1138	Alphabet Board Path	[无]	C
1139	Largest 1-Bordered Square	[无]	C
1140	Stone Game II	[无]	C
1141	Database Problem: Link	-	-	-	-

1143	Longest Common Subsequence	[无]	C
1144	Decrease Elements To Make Array Zigzag	[无]	C
1145	Binary Tree Coloring Game	[无]	C
1146	Snapshot Array	[无]	C
1147	Longest Chunked Palindrome Decomposition	[无]	C
1148	Database Problem: Link	-	-	-	-

1150	Check If a Number Is Majority Element in a Sorted Array	[无]	C
1151	Minimum Swaps to Group All 1's Together	[无]	C
1152	Analyze User Website Visit Pattern	[无]	C
1153	String Transforms Into Another String	[无]	C
1154	Day of the Year	[无]	C
1155	Number of Dice Rolls With Target Sum	[无] [缺：空间优化]	C
1156	Swap For Longest Repeated Character Substring	[无]	C
1157	Online Majority Element In Subarray	[无]	C
1158	Database Problem: Link	-	-	-	-

1160	Find Words That Can Be Formed by Characters	[无]	C
1161	Maximum Level Sum of a Binary Tree	[无]	C
1162	As Far from Land as Possible	[无]	C
1163	Last Substring in Lexicographical Order	[无]	C

1165	Single-Row Keyboard	[无]	C
1166	Design File System	[无]	C
1167	Minimum Cost to Connect Sticks	[无]	C
1168	Optimize Water Distribution in a Village	[无]	C
1169	Invalid Transactions	[无]	C
1170	Compare Strings by Frequency of the Smallest Character	[无]	C
1171	Remove Zero Sum Consecutive Nodes from Linked List	[无]	C
1172	Dinner Plate Stacks	[无]	C
1173	Database Problem: Link	-	-	-	-

1175	Prime Arrangements	[无]	C
1176	Diet Plan Performance	[无]	C
1177	Can Make Palindrome from Substring	[无]	C
1178	Number of Valid Words for Each Puzzle	[无]	C

1180	Count Substrings with Only One Distinct Letter	[无]	C
1181	Before and After Puzzle	[无]	C
1182	Shortest Distance to Target Color	[无]	C
1183	Maximum Number of Ones	[无]	C
1184	Distance Between Bus Stops	[无]	C
1185	Day of the Week	[无]	C
1186	Maximum Subarray Sum with One Deletion	[无]	C
1187	Make Array Strictly Increasing	[无] [缺：动态规划]	C

1189	Maximum Number of Balloons	[无]	C
1190	Reverse Substrings Between Each Pair of Parentheses	[无]	C
1191	K-Concatenation Maximum Sum	[无]	C
1192	Critical Connections in a Network	[无]	C

1196	How Many Apples Can You Put into the Basket	[无]	C
1197	Minimum Knight Moves	[无]	C
1198	Find Smallest Common Element in All Rows	[无]	C
1199	Minimum Time to Build Blocks	[无]	C
1200	Minimum Absolute Difference	[无]	C
1201	Ugly Number III	[无]	C
1202	Smallest String With Swaps	[无]	C
1203	Sort Items by Groups Respecting Dependencies	[无]	C

1207	Unique Number of Occurrences	[无]	C
1208	Get Equal Substrings Within Budget	[无]	C
1209	Remove All Adjacent Duplicates in String II	[无]	C
1210	Minimum Moves to Reach Target with Rotations	[无]	C
1211	Database Problem: Link	-	-	-	-

1213	Intersection of Three Sorted Arrays	[无]	C
1214	Two Sum BSTs	[无]	C
1215	Stepping Numbers	[无]	C
1216	Valid Palindrome III	[无]	C
1217	Play with Chips	[无]	C
1218	Longest Arithmetic Subsequence of Given Difference	[无]	C
1219	Path with Maximum Gold	[无]	C
1220	Count Vowels Permutation	[无]	C
1221	Split a String in Balanced Strings	[无]	C
1222	Queens That Can Attack the King	[无]	C
1223	Dice Roll Simulation	[无]	C
1224	Maximum Equal Frequency	[无]	C

1228	Missing Number In Arithmetic Progression	[无]	C
1229	Meeting Scheduler	[无]	C
1230	Toss Strange Coins	[无]	C
1231	Divide Chocolate	[无]	C
1232	Check If It Is a Straight Line	[无]	C
1233	Remove Sub-Folders from the Filesystem	[无]	C
1234	Replace the Substring for Balanced String	[无]	C
1235	Maximum Profit in Job Scheduling	[无]	C
1236	Web Crawler	[无]	C
1237	Find Positive Integer Solution for a Given Equation	[无]	C
1238	Circular Permutation in Binary Representation	[无]	C
1239	Maximum Length of a Concatenated String with Unique Characters	[无]	C
1240	Tiling a Rectangle with the Fewest Squares	[无]	C

1243	Array Transformation	[无]	C
1244	Design A Leaderboard	[无]	C
1245	Tree Diameter	[无]	C

1247	Minimum Swaps to Make Strings Equal	[无]	C
1248	Count Number of Nice Subarrays	[无]	C	Java
1249	Minimum Remove to Make Valid Parentheses	solution	C
1250	Check If It Is a Good Array	[无]	C
1251	Database Problem: Link	-	-	-	-
1252	Cells with Odd Values in a Matrix	[无]	C
1253	Reconstruct a 2-Row Binary Matrix	[无]	C
1254	Number of Closed Islands	[无]	C
1255	Maximum Score Words Formed by Letters	[无]	C

1259	Handshakes That Don't Cross	[无]	C
1260	Shift 2D Grid	solution	C
1261	Find Elements in a Contaminated Binary Tree	C
1262	Greatest Sum Divisible by Three	[无]	C
1263	Minimum Moves to Move a Box to Their Target Location	[无]	C
1264	Database Problem: Link	-	-	-	-

1272	Remove Interval	[无]	C

1275	Find Winner on a Tic Tac Toe Game	[无]	C

1277	Count Square Submatrices with All Ones	题解	C
1278	Palindrome Partitioning III	[无]	C

1280	Database Problem: Link	-	-	-	-
1281	Subtract the Product and Sum of Digits of an Integer	[无]	C
1282	Group the People Given the Group Size They Belong To	[无]	C

1286	Iterator for Combination	solution	C

1288	Remove Covered Intervals	solution	C
1289	Minimum Falling Path Sum II	[无]	C
1290	Convert Binary Number in a Linked List to Integer	solution	C
1291	Sequential Digits	solution	C

1293	Shortest Path in a Grid with Obstacles Elimination	solution	C

1302	Deepest Leaves Sum	solution	C
1303	Database Problem: Link	-	-	-	-
1304	Find N Unique Integers Sum up to Zero	[无]	C
1305	All Elements in Two Binary Search Trees	[无]	C
1306	Jump Game III	[无]	C
1307	Verbal Arithmetic Puzzle	[无]	C

1309	Decrypt String from Alphabet to Integer Mapping	[无]	C
1310	XOR Queries of a Subarray	[无]	C
1311	Get Watched Videos by Your Friends	[无]	C
1312	Minimum Insertion Steps to Make a String Palindrome	[无]	C

1317	Convert Integer to the Sum of Two No-Zero Integers	[无]	C
1318	Minimum Flips to Make a OR b Equal to c	[无]	C
1319	Number of Operations to Make Network Connected	[无]	C

1323	Maximum 69 Number	[无]	C

1326	Minimum Number of Taps to Open to Water a Garden	[无]	C

1328	Break a Palindrome	solution	C
1329	Sort the Matrix Diagonally	solution	C
1330	Reverse Subarray To Maximize Array Value	[无]	C
1331	Rank Transform of an Array	[无]	C
1332	Remove Palindromic Subsequences	solution	C
1333	Filter Restaurants by Vegan-Friendly, Price and Distance	[无]	C
1334	Find the City With the Smallest Number of Neighbors at a Threshold Distance	[无]	C
1335	Minimum Difficulty of a Job Schedule	[无]	C

1337	The K Weakest Rows in a Matrix	solution	C
1338	Reduce Array Size to The Half	solution	C
1339	Maximum Product of Splitted Binary Tree	solution	C
1340	Jump Game V	[无]	C
1341	Database Problem: Link	-	-	-	-
1342	Number of Steps to Reduce a Number to Zero	[无]	C
1343	Number of Sub-arrays of Size K and Average Greater than or Equal to Threshold	[无]	C
1344	Angle Between Hands of a Clock	C
1345	Jump Game IV	[无]	C
1346	Check If N and Its Double Exist	[无]	C
1347	Minimum Number of Steps to Make Two Strings Anagram	[无]	C
1348	Tweet Counts Per Frequency	[无]	C
1349	Maximum Students Taking Exam	[无]	C
1350	Database Problem: Link	-	-	-	-
1351	Count Negative Numbers in a Sorted Matrix	[无]	C
1352	Product of the Last K Numbers	[无]	C
1353	Maximum Number of Events That Can Be Attended	[无]	C
1354	Construct Target Array With Multiple Sums	solution	C
1355	Database Problem: Link	-	-	-	-
1356	Sort Integers by The Number of 1 Bits	[无]	C
1357	Apply Discount Every n Orders	[无]	C
1358	Number of Substrings Containing All Three Characters	[无]	C
1359	Count All Valid Pickup and Delivery Options	[无]	C
1360	Number of Days Between Two Dates	[无]	C
1361	Validate Binary Tree Nodes	[无]	C
1362	Closest Divisors	[无]	C
1363	Largest Multiple of Three	[无]	C
1364	Database Problem: Link	-	-	-	-
1365	How Many Numbers Are Smaller Than the Current Number	[无]	C
1366	Rank Teams by Votes	[无]	C
1367	Linked List in Binary Tree	[无]	C
1368	Minimum Cost to Make at Least One Valid Path in a Grid	[无]	C
1369	Database Problem: Link	-	-	-	-
1370	Increasing Decreasing String	[无]	C
1371	Find the Longest Substring Containing Vowels in Even Counts	[无]	C
1372	Longest ZigZag Path in a Binary Tree	题解 [缺：dp，返回值DFS]	C
1373	Maximum Sum BST in Binary Tree	[无]	C
1374	Generate a String With Characters That Have Odd Counts	[无]	C
1375	Bulb Switcher III	[无]	C
1376	Time Needed to Inform All Employees	[无]	C
1377	Frog Position After T Seconds	[无]	C
1378	Database Problem: Link	-	-	-	-
1379	Find a Corresponding Node of a Binary Tree in a Clone of That Tree	[无]	C

1383	Maximum Performance of a Team	[无]	C
1384	Database Problem: Link	-	-	-	-

1389	Create Target Array in the Given Order	[无]	C
1390	Four Divisors	[无]	C
1391	Check if There is a Valid Path in a Grid	[无]	C
1392	Longest Happy Prefix	[无]	C
1393	Database Problem: Link	-	-	-	-
1394	Find Lucky Integer in an Array	[无]	C
1395	Count Number of Teams	[无] [缺：线段树]	C
1396	Design Underground System	solution	C
1397	Find All Good Strings	[无] [缺：双端数位 DP]	C
1398	Database Problem: Link	-	-	-	-
1399	Count Largest Group	[无]	C
1400	Construct K Palindrome Strings	[无]	C
1401	Circle and Rectangle Overlapping	[无]	C
1402	Reducing Dishes	[无]	C
1403	Minimum Subsequence in Non Increasing Order	[无]	C
1404	Number of Steps to Reduce a Number in Binary Representation to One	[无]	C
1405	Longest Happy String	[无]	C
1406	Stone Game III	[无]	C
1407	Database Problem: Link	-	-	-	-
1408	String Matching in an Array	[无]	C
1409	Queries on a Permutation With Key	[无] [缺：BIT]	C
1410	HTML Entity Parser	[无]	C
1411	Number of Ways to Paint N × 3 Grid	[无]	C
1412	Database Problem: Link	-	-	-	-
1413	Minimum Value to Get Positive Step by Step Sum	[无]	C
1414	Find the Minimum Number of Fibonacci Numbers Whose Sum Is K	[无]	C
1415	The k-th Lexicographical String of All Happy Strings of Length n	[无]	C
1416	Restore The Array	[无]	C
1417	Reformat The String	[无]	C
1418	Display Table of Food Orders in a Restaurant	[无]	C
1419	Minimum Number of Frogs Croaking	[无]	C
1420	Build Array Where You Can Find The Maximum Exactly K Comparisons	[无]	C
1421	Database Problem: Link	-	-	-	-
1422	Maximum Score After Splitting a String	[无]	C
1423	Maximum Points You Can Obtain from Cards	[无]	C
1424	Diagonal Traverse II	[无]	C
1425	Constrained Subset Sum	[无]	C
1426	Counting Elements	solution	C
1427	Perform String Shifts	solution	C
1428	Leftmost Column with at Least a One	solution	C
1429	First Unique Number	solution	C
1430	Check If a String Is a Valid Sequence from Root to Leaves Path in a Binary Tree	[无]	C
1431	Kids With the Greatest Number of Candies	[无]	C
1432	Max Difference You Can Get From Changing an Integer	[无]	C
1433	Check If a String Can Break Another String	[无]	C
1434	Number of Ways to Wear Different Hats to Each Other	[无]	C
1435	Database Problem: Link	-	-	-	-
1436	Destination City	[无]	C
1437	Check If All 1's Are at Least Length K Places Away	[无]	C
1438	Longest Continuous Subarray With Absolute Diff Less Than or Equal to Limit	[无]	C
1439	Find the Kth Smallest Sum of a Matrix With Sorted Rows	[无]	C
1440	Database Problem: Link	-	-	-	-
1441	Build an Array With Stack Operations	[无]	C
1442	Count Triplets That Can Form Two Arrays of Equal XOR	[无] [缺：O(n)]	C
1443	Minimum Time to Collect All Apples in a Tree	[无]	C
1444	Number of Ways of Cutting a Pizza	[无]	C
1445	Database Problem: Link	-	-	-	-
1446	Consecutive Characters	[无]	C
1447	Simplified Fractions	[无]	C
1448	Count Good Nodes in Binary Tree	[无]	C
1449	Form Largest Integer With Digits That Add up to Target	[无]	C
1450	Number of Students Doing Homework at a Given Time	[无]	C
1451	Rearrange Words in a Sentence	[无]	C
1452	People Whose List of Favorite Companies Is Not a Subset of Another List	[无]	C
1453	Maximum Number of Darts Inside of a Circular Dartboard	[无] [缺：Angular Sweep]	C
1454	Database Problem: Link	-	-	-	-
1455	Check If a Word Occurs As a Prefix of Any Word in a Sentence	[无]	C
1456	Maximum Number of Vowels in a Substring of Given Length	[无]	C
1457	Pseudo Palindromic Paths in a Binary Tree	[无]	C
1458	Max Dot Product of Two Subsequences	[无]	C
1459	Database Problem: Link	-	-	-	-
1460	Make Two Arrays Equal by Reversing Sub-arrays	[无]	C
1461	Check If a String Contains All Binary Codes of Size K	[无]	C
1462	Course Schedule IV	[无]	C
1463	Cherry Pickup II	[无]	C
1464	Maximum Product of Two Elements in an Array	[无]	C
1465	Maximum Area of a Piece of Cake After Horizontal and Vertical Cuts	[无]	C
1466	Reorder Routes to Make All Paths Lead to the City Zero	[无]	C
1467	Probability of a Two Boxes Having The Same Number of Distinct Balls	[无]	C
1468	Database Problem: Link	-	-	-	-
1469	Find All the Lonely Nodes	[无]	C
1470	Shuffle the Array	[无]	C
1471	The k Strongest Values in an Array	[无]	C
1472	Design Browser History	[无]	C
1473	Paint House III	[无]	C
1474	Delete N Nodes After M Nodes of a Linked List	[无]	C
1475	Final Prices With a Special Discount in a Shop	[无]	C
1476	Subrectangle Queries	[无]	C
1477	Find Two Non-overlapping Sub-arrays Each With Target Sum	[无]	C
1478	Allocate Mailboxes	[无]	C
1479	Database Problem: Link	-	-	-	-
1480	Running Sum of 1d Array	[无]	C
1481	Least Number of Unique Integers after K Removals	[无]	C
1482	Minimum Number of Days to Make m Bouquets	[无]	C
1483	Kth Ancestor of a Tree Node	[无]	C
1484	Database Problem: Link	-	-	-	-
1485	Clone Binary Tree With Random Pointer	[无]	C
1486	XOR Operation in an Array	[无]	C
1487	Making File Names Unique	[无]	C
1488	Avoid Flood in The City	[无]	C
1489	Find Critical and Pseudo-Critical Edges in Minimum Spanning Tree	[无] [缺：O(ElogE) 的解]	C
1490	Clone N-ary Tree	[无]	C
1491	Average Salary Excluding the Minimum and Maximum Salary	[无]	C
1492	The kth Factor of n	[无]	C
1493	Longest Subarray of 1's After Deleting One Element	[无]	C
1494	Parallel Courses II	[无]	C
1495	Database Problem: Link	-	-	-	-
1496	Path Crossing	[无]	C
1497	Check If Array Pairs Are Divisible by k	[无]	C
1498	Number of Subsequences That Satisfy the Given Sum Condition	[无]	C
1499	Max Value of Equation	[无]	C

1506	Find Root of N-Ary Tree	solution	C

1519	Number of Nodes in the Sub-Tree With the Same Label	solution	C

1522	Diameter of N-Ary Tree	[无]	C
1523	Count Odd Numbers in an Interval Range	[无]	C

1527	Database Problem: Link	-	-	-	-

1531	String Compression II	[无][缺：其他解法]	C

1533	Find the Index of the Large Integer	solution	C

1539	Kth Missing Positive Number	solution	C

1557	Minimum Number of Vertices to Reach All Nodes	[无]	C

1559	Detect Cycles in 2D Grid	[无]	C

1564	Put Boxes Into the Warehouse I	[无]	C

1570	Dot Product of Two Sparse Vectors	solution	C
1571	Database Problem: Link	-	-	-	-
1572	Matrix Diagonal Sum	[无]	C

1574	Shortest Subarray to be Removed to Make Array Sorted	[无]	C
1575	Count All Possible Routes	[无]	C
1576	Replace All ?'s to Avoid Consecutive Repeating Characters	[无]	C
1577	Number of Ways Where Square of Number Is Equal to Product of Two Numbers	[无]	C
1578	Minimum Deletion Cost to Avoid Repeating Letters	[无]	C
1579	Remove Max Number of Edges to Keep Graph Fully Traversable	[无]	C
1580	Put Boxes Into the Warehouse II	[无]	C
1581	Database Problem: Link	-	-	-	-
1582	Special Positions in a Binary Matrix	[无]	C
1583	Count Unhappy Friends	[无]	C
1584	Min Cost to Connect All Points	[无] [缺：prim 和 ]	C
1585	Check If String Is Transformable With Substring Sort Operations	[无]	C
1586	Binary Search Tree Iterator II	[无] [缺：用栈模拟]	C
1587	Database Problem: Link	-	-	-	-
1588	Sum of All Odd Length Subarrays	[无]	C
1589	Maximum Sum Obtained of Any Permutation	[无]	C
1590	Make Sum Divisible by P	[无]	C
1591	Strange Printer II	[无]	C
1592	Rearrange Spaces Between Words	[无]	C
1593	Split a String Into the Max Number of Unique Substrings	[无]	C
1863	Maximum Non Negative Product in a Matrix	[无]	C
1595	Minimum Cost to Connect Two Groups of Points	[无]	C
1596	Database Problem: Link	-	-	-	-
1597	Build Binary Expression Tree From Infix Expression	[无]	C
1598	Crawler Log Folder	[无]	C
1599	Maximum Profit of Operating a Centennial Wheel	[无]	C
1600	Throne Inheritance	[无]	C
1601	Maximum Number of Achievable Transfer Requests	[无] [缺：网络流解法]	C
1602	Find Nearest Right Node in Binary Tree	solution	C
1603	Design Parking System	[无]	C
1604	Alert Using Same Key-Card Three or More Times in a One Hour Period	[无]	C
1605	Find Valid Matrix Given Row and Column Sums	[无]	C
1606	Find Servers That Handled Most Number of Requests	[无]	C
1607	Database Problem: Link	-	-	-	-
1608	Special Array With X Elements Greater Than or Equal X	[无]	C
1609	Even Odd Tree	[无]	C
1610	Maximum Number of Visible Points	[无]	C
1611	Minimum One Bit Operations to Make Integers Zero	[无]	C
1612	Check If Two Expression Trees are Equivalent	[无]	C
1613	Database Problem: Link	-	-	-	-
1614	Maximum Nesting Depth of the Parentheses	[无]	C
1615	Maximal Network Rank	[无]	C
1616	Split Two Strings to Make Palindrome	[无]	C
1617	Count Subtrees With Max Distance Between Cities	[无]	C
1618	Maximum Font to Fit a Sentence in a Screen	[无]	C
1619	Mean of Array After Removing Some Elements	[无]	C
1620	Coordinate With Maximum Network Quality	[无]	C
1621	Number of Sets of K Non-Overlapping Line Segments	[无]	C
1622	Fancy Sequence	[无]	C
1623	Database Problem: Link	-	-	-	-
1624	Largest Substring Between Two Equal Characters	[无]	C
1625	Lexicographically Smallest String After Applying Operations	[无]	C
1626	Best Team With No Conflicts	[无] [缺：nlogn 算法]	C
1627	Graph Connectivity With Threshold	[无]	C
1628	Design an Expression Tree With Evaluate Function	[无]	C
1629	Slowest Key	[无]	C
1630	Arithmetic Subarrays	[无]	C
1631	Path With Minimum Effort	solution	C
1632	Rank Transform of a Matrix	solution	C
1633	Database Problem: Link	-	-	-	-
1634	Add Two Polynomials Represented as Linked Lists	[无]	C
1635	Database Problem: Link	-	-	-	-
1636	Sort Array by Increasing Frequency	[无]	C
1637	Widest Vertical Area Between Two Points Containing No Points	[无]	C
1638	Count Substrings That Differ by One Character	[无]	C
1639	Number of Ways to Form a Target String Given a Dictionary	[无]	C
1640	Check Array Formation Through Concatenation	solution	C
1641	Count Sorted Vowel Strings	solution	C
1642	Furthest Building You Can Reach	[无]	C
1643	Kth Smallest Instructions	[无]	C
1644	Lowest Common Ancestor of a Binary Tree II	[无]	C
1645	Database Problem: Link	-	-	-	-
1646	Get Maximum in Generated Array	solution	C
1647	Minimum Deletions to Make Character Frequencies Unique	[无]	C
1648	Sell Diminishing-Valued Colored Balls	[无]	C
1649	Create Sorted Array through Instructions	solution [缺：树状数组；归并]	C
1650	Lowest Common Ancestor of a Binary Tree III	[无]	C
1651	Database Problem: Link	-	-	-	-
1652	Defuse the Bomb	[无]	C
1653	Minimum Deletions to Make String Balanced	[无]	C
1654	Minimum Jumps to Reach Home	[无]	C
1655	Distribute Repeating Integers	[无]	C
1656	Design an Ordered Stream	[无]	C
1657	Determine if Two Strings Are Close	solution	C
1658	Minimum Operations to Reduce X to Zero	solution	C
1659	Maximize Grid Happiness	[无]	C	Java
1660	Correct a Binary Tree	[无]	C
1661	Database Problem: Link	-	-	-	-
1662	Check If Two String Arrays are Equivalent	solution	C
1663	Smallest String With A Given Numeric Value	solution	C
1664	Ways to Make a Fair Array	[无]	C
1665	Minimum Initial Energy to Finish Tasks	[无]	C
1666	Change the Root of a Binary Tree	[无]	C
1667	Database Problem: Link	-	-	-	-
1668	Maximum Repeating Substring	[无]	C
1669	Merge In Between Linked Lists	[无]	C
1670	Design Front Middle Back Queue	[无]	C
1671	Minimum Number of Removals to Make Mountain Array	[无]	C
1672	Richest Customer Wealth	[无]	C
1673	Find the Most Competitive Subsequence	solution	C
1674	Minimum Moves to Make Array Complementary	[无]	C
1675	Minimize Deviation in Array	solution	C
1676	Lowest Common Ancestor of a Binary Tree IV	[无]	C
1677	Database Problem: Link	-	-	-	-
1678	Goal Parser Interpretation	[无]	C
1679	Max Number of K-Sum Pairs	solution	C
1680	Concatenation of Consecutive Binary Numbers	solution	C
1681	Minimum Incompatibility	[无]	C
1682	Longest Palindromic Subsequence II	[无]	C
1683	Database Problem: Link	-	-	-	-
1684	Count the Number of Consistent Strings	[无]	C
1685	Sum of Absolute Differences in a Sorted Array	[无]	C
1686	Stone Game VI	[无]	C
1687	Delivering Boxes from Storage to Ports	[无] [缺：dp 优化]	C
1688	Count of Matches in Tournament	C
1689	Partitioning Into Minimum Number Of Deci-Binary Numbers	solution	C
1690	Stone Game VII	solution [缺：记忆化搜索；DP 空间优化]	C
1691	Maximum Height by Stacking Cuboids	[无]	C
1692	Count Ways to Distribute Candies	[无]	C
1693	Database Problem: Link	-	-	-	-
1694	Reformat Phone Number	[无]	C
1695	Maximum Erasure Value	[无]	C
1696	Jump Game VI	[无]	C
1697	Checking Existence of Edge Length Limited Paths	[无]	C
1698	Number of Distinct Substrings in a String	[无]	C
1699	Database Problem: Link	-	-	-	-
1700	Number of Students Unable to Eat Lunch	[无]	C
1701	Average Waiting Time	[无]	C
1702	Maximum Binary String After Change	[无]	C
1703	Minimum Adjacent Swaps for K Consecutive Ones	[无]	C
1704	Determine if String Halves Are Alike	solution	C
1705	Maximum Number of Eaten Apples	solution	C
1706	Where Will the Ball Fall	[无]	C
1707	Maximum XOR With an Element From Array	[无]	C
1708	Largest Subarray Length K	[无]	C
1709	Database Problem: Link	-	-	-	-
1710	Maximum Units on a Truck	solution	C
1711	Count Good Meals	[无]	C
1712	Ways to Split Array Into Three Subarrays	solution	C
1713	Minimum Operations to Make a Subsequence	[无]	C
1714	Sum Of Special Evenly-Spaced Elements In Array	[无]	C
1715	Database Problem: Link	-	-	-	-
1716	Calculate Money in Leetcode Bank	[无]	C
1717	Maximum Score From Removing Substrings	[无]	C
1718	Construct the Lexicographically Largest Valid Sequence	[无]	C
1719	Number Of Ways To Reconstruct A Tree	[无]	C
1720	Decode XORed Array	[无]	C
1721	Swapping Nodes in a Linked List	[无]	C
1722	Minimize Hamming Distance After Swap Operations	[无]	C
1723	Find Minimum Time to Finish All Jobs	[无]	C
1724	Checking Existence of Edge Length Limited Paths II	[无]	C
1725	Number Of Rectangles That Can Form The Largest Square	[无]	C
1726	Tuple with Same Product	[无]	C
1727	Largest Submatrix With Rearrangements	[无]	C
1728	Cat and Mouse II	[无]	C
1729	Database Problem: Link	-	-	-	-
1730	Shortest Path to Get Food	[无]	C
1731	Database Problem: Link	-	-	-	-
1732	Find the Highest Altitude	[无]	C
1733	Minimum Number of People to Teach	[无]	C
1734	Decode XORed Permutation	[无]	C
1735	Count Ways to Make Array With Product	[无]	C
1736	Latest Time by Replacing Hidden Digits	[无]	C
1737	Change Minimum Characters to Satisfy One of Three Conditions	[无]	C
1738	Find Kth Largest XOR Coordinate Value	[无]	C
1739	Building Boxes	[无] [缺：二分；数学]	C
1740	Find Distance in a Binary Tree	[无] [缺：LCA]	C
1741	Database Problem: Link	-	-	-	-
1742	Maximum Number of Balls in a Box	[无]	C
1743	Restore the Array From Adjacent Pairs	[无]	C
1744	Can You Eat Your Favorite Candy on Your Favorite Day?	[无]	C
1745	Palindrome Partitioning IV	[无]	C
1746	Maximum Subarray Sum After One Operation	[无]	C
1747	Database Problem: Link	-	-	-	-
1748	Sum of Unique Elements	[无]	C
1749	Maximum Absolute Sum of Any Subarray	[无]	C
1750	Minimum Length of String After Deleting Similar Ends	[无]	C
1751	Maximum Number of Events That Can Be Attended II	[无]	C
1752	Check if Array Is Sorted and Rotated	[无]	C
1753	Maximum Score From Removing Stones	[无]	C
1754	Largest Merge Of Two Strings	[无]	C
1755	Closest Subsequence Sum	[无]	C
1756	Design Most Recently Used Queue	[无] [缺：线段树，sqrt 分解]	C
1757	Database Problem: Link	-	-	-	-
1758	Minimum Changes To Make Alternating Binary String	[无]	C
1759	Count Number of Homogenous Substrings	[无]	C
1760	Minimum Limit of Balls in a Bag	[无]	C
1761	Minimum Degree of a Connected Trio in a Graph	[无]	C
1762	Buildings With an Ocean View	[无]	C
1763	Longest Nice Substring	[无]	C
1764	Form Array by Concatenating Subarrays of Another Array
1765	Map of Highest Peak	[无]	C
1766	Tree of Coprimes	[无]	C
1767	Database Problem: Link	-	-	-	-
1768	Merge Strings Alternately	[无]	C
1769	Minimum Number of Operations to Move All Balls to Each Box	[无]	C
1770	Maximum Score from Performing Multiplication Operations	[无]	C
1771	Maximize Palindrome Length From Subsequences	[无]	C
1772	Sort Features by Popularity	[无]	C
1773	Count Items Matching a Rule	[无]	C
1774	Closest Dessert Cost	[无]	C
1775	Equal Sum Arrays With Minimum Number of Operations	[无]	C
1776	Car Fleet II	[无] [缺：stack]	C
1777	Database Problem: Link	-	-	-	-
1778	Shortest Path in a Hidden Grid	[无]	C
1779	Find Nearest Point That Has the Same X or Y Coordinate	[无]	C
1780	Check if Number is a Sum of Powers of Three	[无]	C
1781	Sum of Beauty of All Substrings	[无]	C
1782	Count Pairs Of Nodes	[无]	C
1783	Database Problem: Link	-	-	-	-
1784	Check if Binary String Has at Most One Segment of Ones	[无]	C
1785	Minimum Elements to Add to Form a Given Sum	[无]	C
1786	Number of Restricted Paths From First to Last Node	[无]	C
1787	Make the XOR of All Segments Equal to Zero	[无]	C
1788	Maximize the Beauty of the Garden	[无]	C
1789	Database Problem: Link	-	-	-	-
1790	Check if One String Swap Can Make Strings Equal	[无]	C
1791	Find Center of Star Graph	[无]	C
1792	Maximum Average Pass Ratio	[无]	C
1793	Maximum Score of a Good Subarray	[无]	C
1794	Count Pairs of Equal Substrings With Minimum Difference	[无]	C
1795	Database Problem: Link	-	-	-	-
1796	Second Largest Digit in a String	[无]	C
1797	Design Authentication Manager	[无]	C
1798	Maximum Number of Consecutive Values You Can Make	[无]	C
1799	Maximize Score After N Operations	[无]	C
1800	Maximum Ascending Subarray Sum	[无]	C
1801	Number of Orders in the Backlog	[无]	C
1802	Maximum Value at a Given Index in a Bounded Array	[无]	C
1803	Count Pairs With XOR in a Range	[无]	C
1804	Implement Trie II (Prefix Tree)	[无]	C
1805	Number of Different Integers in a String	[无]	C
1806	Minimum Number of Operations to Reinitialize a Permutation	[无] [缺：数学方法]	C
1807	Evaluate the Bracket Pairs of a String	[无]	C
1808	Maximize Number of Nice Divisors	[无]	C
1809	Database Problem: Link	-	-	-	-
1810	Minimum Path Cost in a Hidden Grid	[无]	C
1811	Database Problem: Link	-	-	-	-
1812	Determine Color of a Chessboard Square	[无]	C
1813	Sentence Similarity III	[无]	C
1814	Count Nice Pairs in an Array	[无]	C
1815	Maximum Number of Groups Getting Fresh Donuts	[无]	C
1816	Truncate Sentence	[无]	C
1817	Finding the Users Active Minutes	[无]	C
1818	Minimum Absolute Sum Difference	[无]	C
1819	Number of Different Subsequences GCDs	[无]	C
1820	Maximum Number of Accepted Invitations	[无]	C
1821	Database Problem: Link	-	-	-	-
1822	Sign of the Product of an Array	[无]	C
1823	Find the Winner of the Circular Game	[无]	C
1824	Minimum Sideway Jumps	[无] [缺：DP]	C
1825	Finding MK Average	[无] [缺：线段树，AVL]	C
1826	Faulty Sensor	[无]	C
1827	Minimum Operations to Make the Array Increasing	[无]	C
1828	Queries on Number of Points Inside a Circle	[无]	C
1829	Maximum XOR for Each Query	[无]	C
1830	Minimum Number of Operations to Make String Sorted	[无]	C
1831	Database Problem: Link	-	-	-	-
1832	Check if the Sentence Is Pangram	[无]	C
1833	Maximum Ice Cream Bars	[无]	C
1834	Single-Threaded CPU	[无]	C
1835	Find XOR Sum of All Pairs Bitwise AND	[无] [缺：数学方法]	C
1836	Remove Duplicates From an Unsorted Linked List	[无]	C
1837	Sum of Digits in Base K	[无]	C
1838	Frequency of the Most Frequent Element	[无]	C
1839	Longest Substring Of All Vowels in Order	[无]	C
1840	Maximum Building Height	[无]	C
1841	Database Problem: Link	-	-	-	-
1842	Next Palindrome Using Same Digits	[无]	C
1843	Database Problem: Link	-	-	-	-
1844	Replace All Digits with Characters	[无]	C
1845	Seat Reservation Manager	[无]	C
1846	Maximum Element After Decreasing and Rearranging	[无]	C
1847	Closest Room	[无]	C
1848	Minimum Distance to the Target Element	[无]	C
1849	Splitting a String Into Descending Consecutive Values	[无]	C
1850	Minimum Adjacent Swaps to Reach the Kth Smallest Number	[无]	C
1851	Minimum Interval to Include Each Query	[无]	C
1852	Distinct Numbers in Each Subarray	[无]	C
1853	Database Problem: Link	-	-	-	-
1854	Maximum Population Year	[无]	C
1855	Maximum Distance Between a Pair of Values	[无]	C
1856	Maximum Subarray Min-Product	[无]	C
1857	Largest Color Value in a Directed Graph	[无]	C
1858	Longest Word With All Prefixes	[无]	C
1859	Sorting the Sentence	[无]	C
1860	Incremental Memory Leak	[无]	C
1861	Rotating the Box	[无]	C
1862	Sum of Floored Pairs	[无]	C
1863	Sum of All Subset XOR Totals	[无] [缺：数学解]	C
1864	Minimum Number of Swaps to Make the Binary String Alternating	[无]	C
1865	Finding Pairs With a Certain Sum	[无]	C
1866	Number of Ways to Rearrange Sticks With K Sticks Visible	[无]	C
1867	Database Problem: Link	-	-	-	-
1868	Product of Two Run-Length Encoded Arrays	[无]	C
1869	Longer Contiguous Segments of Ones than Zeros	[无]	C
1870	Minimum Speed to Arrive on Time	[无]	C
1871	Jump Game VII	[无]	C
1872	Stone Game VIII	solution
1873	Database Problem: Link	-	-	-	-
1874	Minimize Product Sum of Two Arrays	[无]	C
1875	Database Problem: Link	-	-	-	-
1876	Substrings of Size Three with Distinct Characters	[无]	C
1877	Minimize Maximum Pair Sum in Array	[无]	C
1878	Get Biggest Three Rhombus Sums in a Grid	[无]	C
1879	Minimum XOR Sum of Two Arrays	[无] [缺：DP]	C
1880	Check if Word Equals Summation of Two Words	[无]	C
1881	Maximum Value after Insertion	[无]	C
1882	Process Tasks Using Servers	[无]	C
1883	Minimum Skips to Arrive at Meeting On Time	[无] [缺：DP]	C
1884	Egg Drop With 2 Eggs and N Floors	[无] [缺：O(1) 数学]	C
1885	Count Pairs in Two Arrays	[无]	C
1886	Determine Whether Matrix Can Be Obtained By Rotation	[无]	C
1887	Reduction Operations to Make the Array Elements Equal	[无]	C
1888	Minimum Number of Flips to Make the Binary String Alternating	[无]	C
1889	Minimum Space Wasted From Packaging	[无]	C
1890	Database Problem: Link	-	-	-	-
1891	Cutting Ribbons	[无]	C
1892	Database Problem: Link	-	-	-	-
1893	Check if All the Integers in a Range Are Covered	[无]	C
1894	Find the Student that Will Replace the Chalk	[无]	C
1895	Largest Magic Square	[无]	C
1896	Minimum Cost to Change the Final Value of Expression	[无]	C
1897	Redistribute Characters to Make All Strings Equal	[无]	C
1898	Maximum Number of Removable Characters	[无]	C
1899	Merge Triplets to Form Target Triplet	[无]	C
1900	The Earliest and Latest Rounds Where Players Compete	[无]	C
1901	Find a Peak Element II	[无]	C
1902	Depth of BST Given Insertion Order	[无]	C
1903	Largest Odd Number in String	[无]	C
1904	The Number of Full Rounds You Have Played	[无]	C
1905	Count Sub Islands	[无]	C
1906	Minimum Absolute Difference Queries	[无] [缺：二分]	C
1907	Database Problem: Link	-	-	-	-
1908	Game of Nim	[无] [缺：dp]	C
1909	Remove One Element to Make the Array Strictly Increasing	[无]	C
1910	Remove All Occurrences of a Substring	[无]	C
1911	Maximum Alternating Subsequence Sum	[无] [缺：dp]	C
1912	Design Movie Rental System	[无]	C
1913	Maximum Product Difference Between Two Pairs	[无]	C
1914	Cyclically Rotating a Grid	[无]	C
1915	Number of Wonderful Substrings	[无]	C
1916	Count Ways to Build Rooms in an Ant Colony	[无]	C
1917	Database Problem: Link	-	-	-	-
1918	Kth Smallest Subarray Sum	[无]	C
1919	Database Problem: Link	-	-	-	-
1920	Build Array from Permutation	[无]	C
1921	Eliminate Maximum Number of Monsters	[无]	C
1922	Count Good Numbers	[无]	C
1923	Longest Common Subpath	[无] [缺：后缀树组 LCP 滚动哈希两次碰撞]	C
1924	Erect the Fence II	[无]	C
1925	Count Square Sum Triples	[无]	C
1926	Nearest Exit from Entrance in Maze	[无]	C
1927	Sum Game	[无]	C
1928	Minimum Cost to Reach Destination in Time	[无]	C
1929	Concatenation of Array	[无]	C
1930	Unique Length-3 Palindromic Subsequences	[无]	C
1931	Painting a Grid With Three Different Colors	[无]	C
1932	Merge BSTs to Create Single BST	[无]	C
1933	Check if String Is Decomposable Into Value-Equal Substrings	[无]	C
1934	Database Problem: Link	-	-	-	-
1935	Maximum Number of Words You Can Type	[无]	C
1936	Add Minimum Number of Rungs	[无]	C
1937	Maximum Number of Points with Cost	[无]	C
1938	Maximum Genetic Difference Query	[无]	C
1939	Database Problem: Link	-	-	-	-
1940	Longest Common Subsequence Between Sorted Arrays	[无]	C
1941	Check if All Characters Have Equal Number of Occurrences	[无]	C
1942	The Number of the Smallest Unoccupied Chair	[无]	C
1943	Describe the Painting	[无]	C
1944	Number of Visible People in a Queue	[无]	C
1945	Sum of Digits of String After Convert	[无]	C
1946	Largest Number After Mutating Substring	[无]	C
1947	Maximum Compatibility Score Sum	[无]	C
1948	Delete Duplicate Folders in System	[无]	C
1949	Database Problem: Link	-	-	-	-
1950	Maximum of Minimum Values in All Subarrays	[无]	C
1951	Database Problem: Link	-	-	-	-
1952	Three Divisors	[无]	C
1953	Maximum Number of Weeks for Which You Can Work	[无]	C
1954	Minimum Garden Perimeter to Collect Enough Apples	[无]	C
1955	Count Number of Special Subsequences	[无]	C
1956	Minimum Time For K Virus Variants to Spread	[无]	C
1957	Delete Characters to Make Fancy String	[无]	C
1958	Check if Move is Legal	[无]	C
1959	Minimum Total Space Wasted With K Resizing Operations	[无]	C
1960	Maximum Product of the Length of Two Palindromic Substrings	[无]	C
1961	Check If String Is a Prefix of Array	[无]	C
1962	Remove Stones to Minimize the Total	[无]	C
1963	Minimum Number of Swaps to Make the String Balanced	[无]	C
1964	Find the Longest Valid Obstacle Course at Each Position	[无]	C
1965	Database Problem: Link	-	-	-	-
1966	Binary Searchable Numbers in an Unsorted Array	[无]	C
1967	Number of Strings That Appear as Substrings in Word	[无]	C
1968	Array With Elements Not Equal to Average of Neighbors	[无]	C
1969	Minimum Non-Zero Product of the Array Elements	[无]	C
1970	Last Day Where You Can Still Cross	[无]	C
1971	Find if Path Exists in Graph	[无]	C
1972	Database Problem: Link	-	-	-	-
1973	Count Nodes Equal to Sum of Descendants	[无]	C
1974	Minimum Time to Type Word Using Special Typewriter	[无]	C
1975	Maximum Matrix Sum	[无]	C
1976	Number of Ways to Arrive at Destination	[无]	C
1977	Number of Ways to Separate Numbers	[无]	C
1978	Database Problem: Link	-	-	-	-
1979	Find Greatest Common Divisor of Array	[无]	C
1980	Find Unique Binary String	[无]	C
1981	Minimize the Difference Between Target and Chosen Elements	[无]	C
1982	Find Array Given Subset Sums	[无]	C
1983	Widest Pair of Indices With Equal Range Sum	[无]	C
1984	Minimum Difference Between Highest and Lowest of K Scores	[无]	C
1985	Find the Kth Largest Integer in the Array	[无]	C
1986	Minimum Number of Work Sessions to Finish the Tasks	[无]	C
1987	Number of Unique Good Subsequences	[无]	C
1988	Database Problem: Link	-	-	-	-
1989	Maximum Number of People That Can Be Caught in Tag	[无]	C
1990	Database Problem: Link	-	-	-	-
1991	Find the Middle Index in Array	[无]	C
1992	Find All Groups of Farmland	[无]	C
1993	Operations on Tree	[无]	C
1994	The Number of Good Subsets	[无]	C
1995	Count Special Quadruplets	[无]	C
1996	The Number of Weak Characters in the Game	[无]	C
1997	First Day Where You Have Been in All the Rooms	[无]	C
1998	GCD Sort of an Array	[无]	C
1999	Smallest Greater Multiple Made of Two Digits	[无]	C
2000	Reverse Prefix of Word	[无]	C
2001	Number of Pairs of Interchangeable Rectangles	[无]	C
2002	Maximum Product of the Length of Two Palindromic Subsequences	[无]	C
2003	Smallest Missing Genetic Value in Each Subtree	[无]	C
2004	Database Problem: Link	-	-	-	-
2005	Subtree Removal Game with Fibonacci Tree	[无]	C
2006	Count Number of Pairs With Absolute Difference K	[无]	C
2007	Find Original Array From Doubled Array	[无]	C
2008	Maximum Earnings From Taxi	[无]	C
2009	Minimum Number of Operations to Make Array Continuous	[无]	C
2010	Database Problem: Link	-	-	-	-
2011	Final Value of Variable After Performing Operations	[无]	C
2012	Sum of Beauty in the Array	[无]	C
2013	Detect Squares	[无]	C
2014	Longest Subsequence Repeated k Times	[无]	C
2015	Average Height of Buildings in Each Segment	[无]	C
2016	Maximum Difference Between Increasing Elements	[无]	C
2017	Grid Game	[无]	C
2018	Check if Word Can Be Placed In Crossword	[无]	C
2019	The Score of Students Solving Math Expression	[无]	C
2020	Database Problem: Link	-	-	-	-
2021	Brightest Position on Street	[无]	C
2022	Convert 1D Array Into 2D Array	[无]	C
2023	Number of Pairs of Strings With Concatenation Equal to Target	[无]	C
2024	Maximize the Confusion of an Exam	[无]	C
2025	Maximum Number of Ways to Partition an Array	[无]	C
2026	Database Problem: Link	-	-	-	-
2027	Minimum Moves to Convert String	[无]	C
2028	Find Missing Observations	[无]	C
2029	Stone Game IX	[无]	C
2030	Smallest K-Length Subsequence With Occurrences of a Letter	[无]	C
2031	Count Subarrays With More Ones Than Zeros	[缺：更简单的解法]	C
2032	Two Out of Three	[无]	C
2033	Minimum Operations to Make a Uni-Value Grid	[无]	C
2034	Stock Price Fluctuation	[无]	C
2035	Partition Array Into Two Arrays to Minimize Sum Difference	[无]	C
2036	Maximum Alternating Subarray Sum	[无]	c
2037	Minimum Number of Moves to Seat Everyone	[无]	C
2038	Remove Colored Pieces if Both Neighbors are the Same Color	[无]	C
2039	The Time When the Network Becomes Idle	[无]	C
2040	Kth Smallest Product of Two Sorted Arrays	[无]	C
2041	Database Problem: Link	-	-	-	-
2042	Check if Numbers Are Ascending in a Sentence	[无]	C
2043	Simple Bank System	[无]	C
2044	Count Number of Maximum Bitwise-OR Subsets	[无]	C
2045	Second Minimum Time to Reach Destination	[无]	C
2046	Sort Linked List Already Sorted Using Absolute Values	[无]	C
2047	Number of Valid Words in a Sentence	[无]	C
2048	Next Greater Numerically Balanced Number	[无]	C
2049	Count Nodes With the Highest Score	[无]	C
2050	Parallel Courses III	[无]	C
2051	Database Problem: Link	-	-	-	-
2052	Minimum Cost to Separate Sentence Into Rows	[无]	C
2053	Kth Distinct String in an Array	[无]	C
2054	Two Best Non-Overlapping Events	[无]	C
2055	Plates Between Candles	[无]	C
2056	Number of Valid Move Combinations On Chessboard	[无]	C
2057	Smallest Index With Equal Value	[无]	C
2058	Find the Minimum and Maximum Number of Nodes Between Critical Points	[无]	C
2059	Minimum Operations to Convert Number	[无]	C
2060	Check if an Original String Exists Given Two Encoded Strings	[无]	C
2061	Number of Spaces Cleaning Robot Cleaned	[无]	C
2062	Count Vowel Substrings of a String	[无]	C
2063	Vowels of All Substrings	[无]	C
2064	Minimized Maximum of Products Distributed to Any Store	[无]	C
2065	Maximum Path Quality of a Graph	[无]	C
2066	Database Problem: Link	-	-	-	-
2067	Number of Equal Count Substrings	[无]	C
2068	Check Whether Two Strings are Almost Equivalent	[无]	C
2069	Walking Robot Simulation II	[无]	C
2070	Most Beautiful Item for Each Query	[无]	C
2071	Maximum Number of Tasks You Can Assign	[无]	C
2072	Database Problem: Link	-	-	-	-
2073	Time Needed to Buy Tickets	[无]	C
2074	Reverse Nodes in Even Length Groups	[无]	C
2075	Decode the Slanted Ciphertext	[无]	C
2076	Process Restricted Friend Requests	[无]	C
2077	Paths in Maze That Lead to Same Room	[无]	C
2078	Two Furthest Houses With Different Colors	[无]	C
2079	Watering Plants	[无]	C
2080	Range Frequency Queries	[无]	C
2081	Sum of k-Mirror Numbers	[无]	C
2082	Database Problem: Link	-	-	-	-
2083	Substrings That Begin and End With the Same Letter	[无]	C
2084	Database Problem: Link	-	-	-	-
2085	Count Common Words With One Occurrence	[无]	C
2086	Minimum Number of Buckets Required to Collect Rainwater from Houses	[无]	C
2087	Minimum Cost Homecoming of a Robot in a Grid	[无]	C
2088	Count Fertile Pyramids in a Land	[无]	C
2089	Find Target Indices After Sorting Array	[无]	C
2090	K Radius Subarray Averages	[无]	C
2091	Removing Minimum and Maximum From Array	[无]	C
2092	Find All People With Secret	[无]	C
2093	Minimum Cost to Reach City With Discounts	[无]	C
2094	Finding 3-Digit Even Numbers	[无]	C
2095	Delete the Middle Node of a Linked List	[无]	C
2096	Step-By-Step Directions From a Binary Tree Node to Another	[无]	C
2097	Valid Arrangement of Pairs	[无]	C
2098	Subsequence of Size K With the Largest Even Sum	[无]	C
2099	Find Subsequence of Length K With the Largest Sum	[无]	C
2100	Find Good Days to Rob the Bank	[无]	C
2101	Detonate the Maximum Bombs	[无]	C
2102	Sequentially Ordinal Rank Tracker	[无]	C
2103	Rings and Rods	[无]	C
2104	Sum of Subarray Ranges	[无]	C
2105	Watering Plants II	[无]	C
2106	Maximum Fruits Harvested After at Most K Steps	[无]	C
2107	Number of Unique Flavors After Sharing K Candies	[无]	C
2108	Find First Palindromic String in the Array	[无]	C
2109	Adding Spaces to a String	[无]	C
2110	Number of Smooth Descent Periods of a Stock	[无]	C
2111	Minimum Operations to Make the Array K-Increasing	[无]	C
2112	Database Problem: Link	-	-	-	-
2113	Elements in Array After Removing and Replacing Elements	[无]	C
2114	Maximum Number of Words Found in Sentences	[无]	C
2115	Find All Possible Recipes from Given Supplies	[无]	C
2116	Check if a Parentheses String Can Be Valid	[无]	C
2117	Abbreviating the Product of a Range	[无]	C
2118	Database Problem: Link	-	-	-	-
2119	A Number After a Double Reversal	[无]	C
2120	Execution of All Suffix Instructions Staying in a Grid	[无]	C
2121	Intervals Between Identical Elements	[无]	C
2122	Recover the Original Array	[无]	C
2123	Minimum Operations to Remove Adjacent Ones in Matrix	[无]	C
2124	Check if All A's Appears Before All B's	[无]	C
2125	Number of Laser Beams in a Bank	[无]	C
2126	Destroying Asteroids	[无]	C
2127	Maximum Employees to Be Invited to a Meeting	[无]	C
2128	Remove All Ones With Row and Column Flips	C
2129	Capitalize the Title	[无]	C
2130	Maximum Twin Sum of a Linked List	[无]	C
2131	Longest Palindrome by Concatenating Two Letter Words	[无]	C
2132	Stamping the Grid	[缺：二维差分数组]	C
2133	Check if Every Row and Column Contains All Numbers	[无]	C
2134	Minimum Swaps to Group All 1's Together II	[无]	C
2135	Count Words Obtained After Adding a Letter	[无]	C
2136	Earliest Possible Day of Full Bloom	[无]	C
2137	Pour Water Between Buckets to Make Water Levels Equal	[无]	C
2138	Divide a String Into Groups of Size k	[无]	C
2139	Minimum Moves to Reach Target Score	[无]	C
2140	Solving Questions With Brainpower	[无]	C
2141	Maximum Running Time of N Computers	[无]	C
2142	Database Problem: Link	-	-	-	-
2143	Choose Numbers From Two Arrays in Range	[无]	C
2144	Minimum Cost of Buying Candies With Discount	[无]	C
2145	Count the Hidden Sequences	[无]	C
2146	K Highest Ranked Items Within a Price Range	[无]	C
2147	Number of Ways to Divide a Long Corridor	[无] [缺：数学更简单的写法；dp]	C
2148	Count Elements With Strictly Smaller and Greater Elements	[无]	C
2149	Rearrange Array Elements by Sign	[无]	C
2150	Find All Lonely Numbers in the Array	[无]	C
2151	Maximum Good People Based on Statements	[无]	C
2152	Minimum Number of Lines to Cover Points	[无]	C
2153	Database Problem: Link	-	-	-	-
2154	Keep Multiplying Found Values by Two	[无]	C
2155	All Divisions With the Highest Score of a Binary Array	[无]	C
2156	Find Substring With Given Hash Value	[无]	C
2157	Groups of Strings	[无]	C
2158	Amount of New Area Painted Each Day	[无]	C
2159	Database Problem: Link	-	-	-	-
2160	Minimum Sum of Four Digit Number After Splitting Digits	[无]	C
2161	Partition Array According to Given Pivot	[无]	C
2162	Minimum Cost to Set Cooking Time	[无]	C
2163	Minimum Difference in Sums After Removal of Elements	[无]	C
2164	Sort Even and Odd Indices Independently	[无]	C
2165	Smallest Value of the Rearranged Number	[无]	C
2166	Design Bitset	[无]	C
2167	Minimum Time to Remove All Cars Containing Illegal Goods	[无]	C
2168	Unique Substrings With Equal Digit Frequency	[无]	C
2169	Count Operations to Obtain Zero	[无]	C
2170	Minimum Operations to Make the Array Alternating	[无]	C
2171	Removing Minimum Number of Magic Beans	[无]	C
2172	Maximum AND Sum of Array	[无]	C
2173	Database Problem: Link	-	-	-	-
2174	Remove All Ones With Row and Column Flips II	[无]	C
2175	Database Problem: Link	-	-	-	-
2176	Count Equal and Divisible Pairs in an Array	[无]	C
2177	Find Three Consecutive Integers That Sum to a Given Number	[无]	C
2178	Maximum Split of Positive Even Integers	[无]	C
2179	Count Good Triplets in an Array	[无]	C
2180	Count Integers With Even Digit Sum	[无]	C
2181	Merge Nodes in Between Zeros	[无]	C
2182	Construct String With Repeat Limit	C
2183	Count Array Pairs Divisible by K	[无]	C
2184	Number of Ways to Build Sturdy Brick Wall	[无]	C
2185	Counting Words With a Given Prefix	[无]	C
2186	Minimum Number of Steps to Make Two Strings Anagram II	[无]	C
2187	Minimum Time to Complete Trips	[无]	C
2188	Minimum Time to Finish the Race	[无]	C
2189	Number of Ways to Build House of Cards	[无]	C
2190	Most Frequent Number Following Key In an Array	[无]	C
2191	Sort the Jumbled Numbers	[无]	C
2192	All Ancestors of a Node in a Directed Acyclic Graph	[无]	C
2193	Minimum Number of Moves to Make Palindrome	[无]	C
2194	Cells in a Range on an Excel Sheet	[无]	C
2195	Append K Integers With Minimal Sum	[无]	C
2196	Create Binary Tree From Descriptions	[无]	C
2197	Replace Non-Coprime Numbers in Array	[无]	C
2198	Number of Single Divisor Triplets	[无]	C
2199	Database Problem: Link	-	-	-	-
2200	Find All K-Distant Indices in an Array	[无]	C
2201	Count Artifacts That Can Be Extracted	[无]	C
2202	Maximize the Topmost Element After K Moves	[无]	C
2203	Minimum Weighted Subgraph With the Required Paths	[无]	C
2204	Distance to a Cycle in Undirected Graph	[无]	C
2205	Database Problem: Link	-	-	-	-
2206	Divide Array Into Equal Pairs	[无]	C
2207	Maximize Number of Subsequences in a String	[无]	C
2208	Minimum Operations to Halve Array Sum	[无]	C
2209	Minimum White Tiles After Covering With Carpets	[无]	C
2210	Count Hills and Valleys in an Array	[无]	C
2211	Count Collisions on a Road	[无]	C
2212	Maximum Points in an Archery Competition	[无]	C
2213	Longest Substring of One Repeating Character	[无]	C
2214	Minimum Health to Beat Game	[无]	C
2215	Find the Difference of Two Arrays	[无]	C
2216	Minimum Deletions to Make Array Beautiful	[无]	C
2217	Find Palindrome With Fixed Length	[无]	C
2218	Maximum Value of K Coins From Piles	[无]	C
2219	Maximum Sum Score of Array	[无]	C
2220	Minimum Bit Flips to Convert Number	[无]	C
2221	Find Triangular Sum of an Array	[无]	C
2222	Number of Ways to Select Buildings	[无]	C
2223	Sum of Scores of Built Strings	[无]	C
2224	Minimum Number of Operations to Convert Time	[无]	C
2225	Find Players With Zero or One Losses	[无]	C
2226	Maximum Candies Allocated to K Children	[无]	C
2227	Encrypt and Decrypt Strings	[无]	C
2228	Database Problem: Link	-	-	-	-
2229	Check if an Array Is Consecutive	[无]	C
2230	Database Problem: Link	-	-	-	-
2231	Largest Number After Digit Swaps by Parity	[无]	C
2232	Minimize Result by Adding Parentheses to Expression	[无]	C
2233	Maximum Product After K Increments	[无]	C
2234	Maximum Total Beauty of the Gardens	[无]	C
2235	Add Two Integers	[无]	C
2236	Root Equals Sum of Children	[无]	C
2237	Count Positions on Street With Required Brightness	[无]	C
2238	Database Problem: Link	-	-	-	-
2239	Find Closest Number to Zero	[无]	C
2240	Number of Ways to Buy Pens and Pencils	[无]	C
2241	Design an ATM Machine	[无]	C
2242	Maximum Score of a Node Sequence	[无]	C
2243	Calculate Digit Sum of a String	[无]	C
2244	Minimum Rounds to Complete All Tasks	[无]	C
2245	Maximum Trailing Zeros in a Cornered Path	[无]	C
2246	Longest Path With Different Adjacent Characters	[无]	C
2247	Maximum Cost of Trip With K Highways	[无]	C
2248	Intersection of Multiple Arrays	[无]	C
2249	Count Lattice Points Inside a Circle	[无]	C
2250	Count Number of Rectangles Containing Each Point	[无]	C
2251	Number of Flowers in Full Bloom	[无]	C
2252	Database Problem: Link	-	-	-	-
2253	Database Problem: Link	-	-	-	-
2254	Design Video Sharing Platform	[无]	C
2255	Count Prefixes of a Given String	[无]	C
2256	Minimum Average Difference	[无]	C
2257	Count Unguarded Cells in the Grid	[无]	C
2258	Escape the Spreading Fire	[无]	C
2259	Remove Digit From Number to Maximize Result	[无]	C
2260	Minimum Consecutive Cards to Pick Up	[无]	C
2261	K Divisible Elements Subarrays	[无]	C
2262	Total Appeal of A String	[无]	C
2263	Make Array Non-decreasing or Non-increasing	[无]	C
2264	Largest 3-Same-Digit Number in String	[无]	C
2265	Count Nodes Equal to Average of Subtree	[无]	C
2266	Count Number of Texts	[无]	C
2267	Check if There Is a Valid Parentheses String Path	[无]	C
2268	Minimum Number of Keypresses	[无]	C
2269	Find the K-Beauty of a Number	[无]	C
2270	Number of Ways to Split Array	[无]	C
2271	Maximum White Tiles Covered by a Carpet	[无]	C
2272		Substring With Largest Variance	[无]	C
2273	Find Resultant Array After Removing Anagrams	[无]	C
2274	Maximum Consecutive Floors Without Special Floors	[无]	C
2275	Largest Combination With Bitwise AND Greater Than Zero	[无]	C
2276	Count Integers in Intervals	[无]	C
2277	Closest Node to Path in Tree	[无]	C
2278	Percentage of Letter in String	[无]	C
2279	Maximum Bags With Full Capacity of Rocks	[无]	C
2280	Minimum Lines to Represent a Line Chart	[无]	C
2281	Sum of Total Strength of Wizards	[无]	C

2283	Check if Number Has Equal Digit Count and Digit Value	[无]	C
2284	Sender With Largest Word Count	[无]	C
2285	Maximum Total Importance of Roads	[无]	C
2286	Booking Concert Tickets in Groups	[无]	C
2287	Rearrange Characters to Make Target String	[无]	C
2288	Apply Discount to Prices	[无]	C
2289	Steps to Make Array Non-decreasing	[无] [缺：用 C STL list]	C
2290	Minimum Obstacle Removal to Reach Corner	[无]	C
2291	Maximum Profit From Trading Stocks	[无]	C
2292	Database Problem: Link	-	-	-	-
2293	Min Max Game	[无]	C
2294	Partition Array Such That Maximum Difference Is K	[无]	C
2295	Replace Elements in an Array	[无]	C
2296	Design a Text Editor	[无]	C
2297	Jump Game IX	[无]	C
2298	Database Problem: Link	-	-	-	-
2299	Strong Password Checker II	[无]	C
2300	Successful Pairs of Spells and Potions	[无]	C
2301	Match Substring After Replacement	[无]	C
2302	Count Subarrays With Score Less Than K	[无]	C
2303	Calculate Amount Paid in Taxes	[无]	C
2304	Minimum Path Cost in a Grid	[无]	C
2305	Fair Distribution of Cookies	[无]	C
2306	Naming a Company	[无]	C

2308	Database Problem: Link	-	-	-	-
2309	Greatest English Letter in Upper and Lower Case	[无]	C
2310	Sum of Numbers With Units Digit K	[无]	C

2312	Selling Pieces of Wood	[无]	C
2313	Minimum Flips in Binary Tree to Get Result	[无]	C
2314	Database Problem: Link	-	-	-	-
2315	Count Asterisks	[无]	C
2316	Count Unreachable Pairs of Nodes in an Undirected Graph	[无]	C
2317	Maximum XOR After Operations	[无]	C
2318	Number of Distinct Roll Sequences	[无]	C
2319	Check if Matrix Is X-Matrix	[无]	C
2320	Count Number of Ways to Place Houses	[无]	C
2321	Maximum Score Of Spliced Array	[无]	C
2322	Minimum Score After Removals on a Tree	[无]	C
2323	Find Minimum Time to Finish All Jobs II	[无]	C
2324	Database Problem: Link	-	-	-	-
2325	Decode the Message	[无]	C
2326	Spiral Matrix IV	[无]	C
2327	Number of People Aware of a Secret	[无]	C
2328	Number of Increasing Paths in a Grid	[无]	C
2329	Database Problem: Link	-	-	-	-
2330	Valid Palindrome IV	[无]	C
2331	Evaluate Boolean Binary Tree	[无]	C
2332	The Latest Time to Catch a Bus	[无]	C
2333	Minimum Sum of Squared Difference	[无]	C
2334	Subarray With Elements Greater Than Varying Threshold	[无]	C
2335	Minimum Amount of Time to Fill Cups	[无]	C
2336	Smallest Number in Infinite Set	[无]	C
2337	Move Pieces to Obtain a String	[无]	C
2338	Count the Number of Ideal Arrays	[无]	C
2339	Database Problem: Link	-	-	-	-
2340	Minimum Adjacent Swaps to Make a Valid Array	[无]	C
2341	Maximum Number of Pairs in Array	[无]	C
2342	Max Sum of a Pair With Equal Sum of Digits	[无]	C
2343	Query Kth Smallest Trimmed Number	[无]	C
2344	Minimum Deletions to Make Array Divisible	[无]	C
2345	Finding the Number of Visible Mountains	[无]	C
2346	Database Problem: Link	-	-	-	-
2347	Best Poker Hand	[无]	C
2348	Number of Zero-Filled Subarrays	[无]	C
2349	Design a Number Container System	[无]	C
2350	Shortest Impossible Sequence of Rolls	[无]	C
2351	First Letter to Appear Twice	[无]	C
2352	Equal Row and Column Pairs	[无]	C
2353	Design a Food Rating System	[无]	C
2354	Number of Excellent Pairs	[无]	C

2356	Database Problem: Link	-	-	-	-
2357	Make Array Zero by Subtracting Equal Amounts	[无]	C
2358	Maximum Number of Groups Entering a Competition	[无]	C
2359	Find Closest Node to Given Two Nodes	[无]	C
2360	Longest Cycle in a Graph	[无]	C
2361	Minimum Costs Using the Train Line	[无]	C
2362	Database Problem: Link	-	-	-	-
2363	Merge Similar Items	[无]	C
2364	Count Number of Bad Pairs	[无]	C
2365	Task Scheduler II	[无]	C
2366	Minimum Replacements to Sort the Array	[无]	C
2367	Number of Arithmetic Triplets	[无]	C
2368	Reachable Nodes With Restrictions	[无]	C
2369	Check if There is a Valid Partition For The Array	[无]	C
2370	Longest Ideal Subsequence	[无]	C

2372	Database Problem: Link	-	-	-	-
2373	Largest Local Values in a Matrix	[无]	C
2374	Node With Highest Edge Score	[无]	C
2375	Construct Smallest Number From DI String	[无]	C
2376	Count Special Integers	[无]	C
2377	Database Problem: Link	-	-	-	-
2378	Choose Edges to Maximize Score in a Tree	[无]	C
2379	Minimum Recolors to Get K Consecutive Black Blocks	[无]	C
2380	Time Needed to Rearrange a Binary String	[无]	C
2381	Shifting Letters II	[无]	C
2382	Maximum Segment Sum After Removals	[无]	C
2383	Minimum Hours of Training to Win a Competition	[无]	C
2384	Largest Palindromic Number	[无]	C
2385	Amount of Time for Binary Tree to Be Infected	[无]	C

2387	Median of a Row Wise Sorted Matrix	[无]	C
2388	Database Problem: Link	-	-	-	-
2389	Longest Subsequence With Limited Sum	[无]	C
2390	Removing Stars From a String	[无]	C
2391	Minimum Amount of Time to Collect Garbage	[无]	C
2392	Build a Matrix With Conditions	[无]	C
2393	Count Strictly Increasing Subarrays	[无]	C
2394	Database Problem: Link	-	-	-	-
2395	Find Subarrays With Equal Sum	[无]	C
2396	Strictly Palindromic Number	[无]	C
2397	Maximum Rows Covered by Columns	[无]	C
2398	Maximum Number of Robots Within Budget	[无][缺：滑动窗口]	C
2399	Check Distances Between Same Letters	[无]	C
2400	Number of Ways to Reach a Position After Exactly k Steps	[无][缺：数学解]	C
2401	Longest Nice Subarray	[无]	C
2402	Meeting Rooms III	[无]	C
2403	Minimum Time to Kill All Monsters	[无]	C
2404	Most Frequent Even Element	[无]	C
2405	Optimal Partition of String	[无]	C
2406	Divide Intervals Into Minimum Number of Groups	[无]	C
2407	Longest Increasing Subsequence II	[无]	C
2408	Design SQL	[无]	C
2409	Count Days Spent Together	[无]	C
2410	Maximum Matching of Players With Trainers	[无]	C
2411	Smallest Subarrays With Maximum Bitwise OR	[无][缺：O(n) 算法]	C
2412	Minimum Money Required Before Transactions	[无] [缺：不用 sort]	C
2413	Smallest Even Multiple	[无]	C
2414	Length of the Longest Alphabetical Continuous Substring	[无]	C
2415	Reverse Odd Levels of Binary Tree	[无]	C
2416	Sum of Prefix Scores of Strings	[无]	C
2417	Closest Fair Integer	[无]	C
2418	Sort the People	[无]	C
2419	Longest Subarray With Maximum Bitwise AND	[无]	C
2420	Find All Good Indices	[无]	C
2421	Number of Good Paths	[无]	C
2422	Merge Operations to Turn Array Into a Palindrome	[无]	C
2423	Remove Letter To Equalize Frequency	[无]	C
2424	Longest Uploaded Prefix	[无]	C
2425	Bitwise XOR of All Pairings	[无]	C
2426	Number of Pairs Satisfying Inequality	[无] [缺：493 问题整理]	C
2427	Number of Common Factors	[无]	C
2428	Maximum Sum of an Hourglass	[无]	C
2429	Minimize XOR	[无]	C
2430	Maximum Deletions on a String	[无]	C
2431	Maximize Total Tastiness of Purchased Fruits	[无]	C
2432	The Employee That Worked on the Longest Task	[无]	C
2433	Find The Original Array of Prefix Xor	[无]	C
2434	Using a Robot to Print the Lexicographically Smallest String	[无]	C
2435	Paths in Matrix Whose Sum Is Divisible by K	[无]	C
2436	Minimum Split Into Subarrays With GCD Greater Than One	[无]	C
2437	Number of Valid Clock Times	[无]	C
2438	Range Product Queries of Powers	[无]	C
2439	Minimize Maximum of Array	[无]	C
2440	Create Components With Same Value	[无]	C
2441	Largest Positive Integer That Exists With Its Negative	[无]	C
2442	Count Number of Distinct Integers After Reverse Operations	[无]	C
2443	Sum of Number and Its Reverse	[无]	C
2444	Count Subarrays With Fixed Bounds	[无]	C
2445	Number of Nodes With Value One	[无]	C
2446	Determine if Two Events Have Conflict	[无]	C
2447	Number of Subarrays With GCD Equal to K	[无]	C
2448	Minimum Cost to Make Array Equal	[无]	C
2449	Minimum Number of Operations to Make Arrays Similar	[无]	C
2450	Number of Distinct Binary Strings After Applying Operations	[无]	C
2451	Odd String Difference	[无]	C
2452	Words Within Two Edits of Dictionary	[无]	C
2453	Destroy Sequential Targets	[无]	C
2454	Next Greater Element IV	[无] [缺：O(n) 解法]	C
2455	Average Value of Even Numbers That Are Divisible by Three	[无]	C
2456	Most Popular Video Creator	[无]	C
2457	Minimum Addition to Make Integer Beautiful	[无]	C
2458	Height of Binary Tree After Subtree Removal Queries	[无]	C
2459	Sort Array by Moving Items to Empty Space	[无]	C
2460	Apply Operations to an Array	[无]	C
2461	Maximum Sum of Distinct Subarrays With Length K	[无]	C
2462	Total Cost to Hire K Workers	[无]	C
2463	Minimum Total Distance Traveled	[无]	C
2464	Minimum Subarrays in a Valid Split	[无]	C
2465	Number of Distinct Averages	[无]	C
2466	Count Ways To Build Good Strings	[无]	C
2467	Most Profitable Path in a Tree	[无]	C
2468	Split Message Based on Limit	[无]	C
2469	Convert the Temperature	[无]	C
2470	Number of Subarrays With LCM Equal to K	[无]	C
2471	Minimum Number of Operations to Sort a Binary Tree by Level	[无]	C
2472	Maximum Number of Non-overlapping Palindrome Substrings	[无]	C
2473	Minimum Cost to Buy Apples	[无]	C
2474	Database Problem: Link	-	-	-	-
2475	Number of Unequal Triplets in Array	[无]	C
2476	Closest Nodes Queries in a Binary Search Tree	[无]	C
2477	Minimum Fuel Cost to Report to the Capital	[无]	C
2478	Number of Beautiful Partitions	[无]	C
2479	Maximum XOR of Two Non-Overlapping Subtrees	[无]	C
2480	Database Problem: Link	-	-	-	-
2481	Minimum Cuts to Divide a Circle	[无]	C
2482	Difference Between Ones and Zeros in Row and Column	[无]	C
2483	Minimum Penalty for a Shop	[无]	C
2484	Count Palindromic Subsequences	[无]	C
2485	Find the Pivot Integer	[无]	C
2486	Append Characters to String to Make Subsequence	[无]	C
2487	Remove Nodes From Linked List	[无]	C
2488	Count Subarrays With Median K	[无]	C
2489	Number of Substrings With Fixed Ratio	[无]	C
2490	Circular Sentence	[无]	C
2491	Divide Players Into Teams of Equal Skill	[无]	C
2492	Minimum Score of a Path Between Two Cities	[无]	C
2493	Divide Nodes Into the Maximum Number of Groups	[无]	C
2494	Database Problem: Link	-	-	-	-
2495	Number of Subarrays Having Even Product	[无]	C
2496	Maximum Value of a String in an Array	[无]	C
2497	Maximum Star Sum of a Graph	[无]	C
2498	Frog Jump II	[无]	C
2499	Minimum Total Cost to Make Arrays Unequal	[无]	C
2500	Delete Greatest Value in Each Row	[无]	C
2501	Longest Square Streak in an Array	[无]	C
2502	Design Memory Allocator	[无]	C
2503	Maximum Number of Points From Grid Queries	[无]	C
2504	Database Problem: Link	-	-	-	-
2505	Bitwise OR of All Subsequence Sums	[无]	C
2506	Count Pairs Of Similar Strings	[无]	C
2507	Smallest Value After Replacing With Sum of Prime Factors	[无]	C
2508	Add Edges to Make Degrees of All Nodes Even	[无]	C
2509	Cycle Length Queries in a Tree	[无]	C
2510	Check if There is a Path With Equal Number of 0's And 1's	[无]	C
2511	Maximum Enemy Forts That Can Be Captured	[无]	C
2512	Reward Top K Students	[无]	C
2513	Minimize the Maximum of Two Arrays	[无]	C
2514	Count Anagrams	[无]	C
2515	Shortest Distance to Target String in a Circular Array	[无]	C
2516	Take K of Each Character From Left and Right	[无]	C
2517	Maximum Tastiness of Candy Basket	[无]	C
2518	Number of Great Partitions	[无]	C
2519	Count the Number of K-Big Indices	[无]	C
2520	Count the Digits That Divide a Number	[无]	C
2521	Distinct Prime Factors of Product of Array	[无]	C
2522	Partition String Into Substrings With Values at Most K	[无]	C
2523	Closest Prime Numbers in Range	[无]	C
2524	Maximum Frequency Score of a Subarray	[无]	C
2525	Categorize Box According to Criteria	[无]	C
2526	Find Consecutive Integers from a Data Stream	[无]	C
2527	Find Xor-Beauty of Array	[无]	C
2528	Maximize the Minimum Powered City	[无]	C
2529	Maximum Count of Positive Integer and Negative Integer	[无]	C
2530	Maximal Score After Applying K Operations	[无]	C
2531	Make Number of Distinct Characters Equal	[无]	C
2532	Time to Cross a Bridge	[无]	C
2533	Number of Good Binary Strings	[无]	C
2534	Time Taken to Cross the Door	[无]	C
2535	Difference Between Element Sum and Digit Sum of an Array	[无]	C
2536	Increment Submatrices by One	[无]	C
2537	Count the Number of Good Subarrays	[无]	C

2539	Count the Number of Good Subsequences	[无]	C
2540	Minimum Common Value	[无]	C
2541	Minimum Operations to Make Array Equal II	[无]	C
2542	Maximum Subsequence Score	[无]	C
2543	Check if Point Is Reachable	[无]	C
2544	Alternating Digit Sum	[无]	C
2545	Sort the Students by Their Kth Score	[无]	C
2546	Apply Bitwise Operations to Make Strings Equal	[无]	C
2547	Minimum Cost to Split an Array	[无]	C
2548	Maximum Price to Fill a Bag	[无]	C
2549	Count Distinct Numbers on Board	[无]	C
2550	Count Collisions of Monkeys on a Polygon	[无]	C
2551	Put Marbles in Bags	[无]	C

2553	Separate the Digits in an Array	[无]	C
2554	Maximum Number of Integers to Choose From a Range I	[无]	C
2555	Maximize Win From Two Segments	[无]	C
2556	Disconnect Path in a Binary Matrix by at Most One Flip	[无]	C
2557	Maximum Number of Integers to Choose From a Range II	[无]	C
2558	Take Gifts From the Richest Pile	[无]	C
2559	Count Vowel Strings in Ranges	[无]	C
2560	House Robber IV	[无]	C
2561	Rearranging Fruits	[无]	C
2562	Find the Array Concatenation Value	[无]	C
2563	Count the Number of Fair Pairs	[无]	C
2564	Substring XOR Queries	[无]	C
2565	Subsequence With the Minimum Score	[无]	C
2566	Maximum Difference by Remapping a Digit	[无]	C
2567	Minimum Score by Changing Two Elements	[无]	C
2568	Minimum Impossible OR	[无]	C
2569	Handling Sum Queries After Update	[无]	C
2570	Merge Two 2D Arrays by Summing Values	[无]	C
2571	Minimum Operations to Reduce an Integer to 0	[无]	C
2572	Count the Number of Square-Free Subsets	[无]	C
2573	Find the String with LCP	[无]	C
2574	Left and Right Sum Differences	[无]	C
2575	Find the Divisibility Array of a String	[无]	C
2576	Find the Maximum Number of Marked Indices	[无]	C
2577	Minimum Time to Visit a Cell In a Grid	[无]	C
2578	Split With Minimum Sum	[无]	C
2579	Count Total Number of Colored Cells	[无]	C
2580	Count Ways to Group Overlapping Ranges	[无]	C
2581	Count Number of Possible Root Nodes	[无]	C
2582	Pass the Pillow	[无]	C
2583	Kth Largest Sum in a Binary Tree	[无]	C
2584	Split the Array to Make Coprime Products	[无]	C
2585	Number of Ways to Earn Points	[无]	C
2586	Count the Number of Vowel Strings in Range	[无]	C
2587	Rearrange Array to Maximize Prefix Score	[无]	C
2588	Count the Number of Beautiful Subarrays	[无]	C
2589	Minimum Time to Complete All Tasks	[无]	C
2590	Design a Todo List	[无]	C
2591	Distribute Money to Maximum Children	[无]	C
2592	Maximize Greatness of an Array	[无]	C
2593	Find Score of an Array After Marking All Elements	[无]	C
2863	Minimum Time to Repair Cars	[无]	C
2595	Number of Even and Odd Bits	[无]	C
2596	Check Knight Tour Configuration	[无]	C
2597	The Number of Beautiful Subsets	[无]	C
2598	Smallest Missing Non-negative Integer After Operations	[无]	C
2599	Make the Prefix Sum Non-negative	[无]	C
2600	K Items With the Maximum Sum	[无]	C
2601	Prime Subtraction Operation	[无]	C
2602	Minimum Operations to Make All Array Elements Equal	[无]	C
2603	Collect Coins in a Tree	[无]	C
2604	Minimum Time to Eat All Grains	[无]	C
2605	Form Smallest Number From Two Digit Arrays	[无]	C
2606	Find the Substring With Maximum Cost	[无]	C
2607	Make K-Subarray Sums Equal	[无]	C
2608	Shortest Cycle in a Graph	[无]	C
2609	Find the Longest Balanced Substring of a Binary String	[无]	C
2610	Convert an Array Into a 2D Array With Conditions	[无]	C
2611	Mice and Cheese	[无]	C
2612	Minimum Reverse Operations	[无]	C

2614	Prime In Diagonal	[无]	C
2615	Sum of Distances	[无]	C
2616	Minimize the Maximum Difference of Pairs	[无]	C
2617	Minimum Number of Visited Cells in a Grid	[无]	C
2618	JavaScript Problem	-	-	-	-
2619	JavaScript Problem	-	-	-	-
2620	JavaScript Problem	-	-	-	-
2621	JavaScript Problem	-	-	-	-
2622	JavaScript Problem	-	-	-	-
2623	JavaScript Problem	-	-	-	-
2624	JavaScript Problem	-	-	-	-
2625	JavaScript Problem	-	-	-	-
2626	JavaScript Problem	-	-	-	-
2627	JavaScript Problem	-	-	-	-
2628	JavaScript Problem	-	-	-	-
2629	JavaScript Problem	-	-	-	-
2630	JavaScript Problem	-	-	-	-
2631	JavaScript Problem	-	-	-	-
2632	JavaScript Problem	-	-	-	-
2633	JavaScript Problem	-	-	-	-
2634	JavaScript Problem	-	-	-	-
2635	JavaScript Problem	-	-	-	-
2636	JavaScript Problem	-	-	-	-
2637	JavaScript Problem	-	-	-	-
2638	Count the Number of K-Free Subsets	[无]	C
2639	Find the Width of Columns of a Grid	[无]	C
2640	Find the Score of All Prefixes of an Array	[无]	C
2641	Cousins in Binary Tree II	[无]	C
2642	Design Graph With Shortest Path Calculator	[无]	C
2643	Row With Maximum Ones	[无]	C
2644	Find the Maximum Divisibility Score	[无]	C
2645	Minimum Additions to Make Valid String	[无]	C
2646	Minimize the Total Price of the Trips	[无]	C
2647	Color the Triangle Red	[无]	C
2648	JavaScript Problem	-	-	-	-
2649	JavaScript Problem	-	-	-	-
2650	JavaScript Problem	-	-	-	-
2651	Calculate Delayed Arrival Time	[无]	C
2652	Sum Multiples	[无]	C
2653	Sliding Subarray Beauty	[无]	C
2654	Minimum Number of Operations to Make All Array Elements Equal to 1	[无]	C
2655	Find Maximal Uncovered Ranges	[无]	C
2656	Maximum Sum With Exactly K Elements	[无]	C
2657	Find the Prefix Common Array of Two Arrays	[无]	C
2658	Maximum Number of Fish in a Grid	[无]	C
2659	Make Array Empty	[无]	C
2660	Determine the Winner of a Bowling Game	[无]	C
2661	First Completely Painted Row or Column	[无]	C
2662	Minimum Cost of a Path With Special Roads	[无]	C
2663	Lexicographically Smallest Beautiful String	[无]	C
2664	The Knight’s Tour	[无]	C
2665	JavaScript Problem	-	-	-	-
2666	JavaScript Problem	-	-	-	-
2667	JavaScript Problem	-	-	-	-
2668	Database Problem: Link	-	-	-	-
2669	Database Problem: Link	-	-	-	-
2670	Find the Distinct Difference Array	[无]	C
2671	Frequency Tracker	[无]	C
2672	Number of Adjacent Elements With the Same Color	[无]	C
2673	Make Costs of Paths Equal in a Binary Tree	[无]	C
2674	Split a Circular Linked List	[无]	C
2675	JavaScript Problem	-	-	-	-
2676	JavaScript Problem	-	-	-	-
2677	JavaScript Problem	-	-	-	-
2678	Number of Senior Citizens	[无]	C
2679	Sum in a Matrix	[无]	C
2680	Maximum OR	[无]	C
2681	Power of Heroes	[无]	C
2682	Find the Losers of the Circular Game	[无]	C
2683	Neighboring Bitwise XOR	[无]	C
2684	Maximum Number of Moves in a Grid	[无]	C
2685	Count the Number of Complete Components	[无]	C
2686	Database Problem: Link	-	-	-	-
2687	Database Problem: Link	-	-	-	-
2688	Database Problem: Link	-	-	-	-
2689	Extract Kth Character From The Rope Tree	[无]	C
2690	JavaScript Problem	-	-	-	-
2691	JavaScript Problem	-	-	-	-
2692	JavaScript Problem	-	-	-	-
2693	JavaScript Problem	-	-	-	-
2694	JavaScript Problem	-	-	-	-
2695	JavaScript Problem	-	-	-	-
2696	Minimum String Length After Removing Substrings	[无]	C
2697	Lexicographically Smallest Palindrome	[无]	C
2698	Find the Punishment Number of an Integer	[无]	C
2699	Modify Graph Edge Weights	[无]	C
2700	JavaScript Problem	-	-	-	-
2701	Database Problem: Link	-	-	-	-
2702	Minimum Operations to Make Numbers Non-positive	[无]	C
2703	JavaScript Problem	-	-	-	-
2704	JavaScript Problem	-	-	-	-
2705	JavaScript Problem	-	-	-	-
2706	Buy Two Chocolates	[无]	C
2707	Extra Characters in a String	[无]	C
2708	Maximum Strength of a Group	[无]	C
2709	Greatest Common Divisor Traversal	[无]	C
2710	Remove Trailing Zeros From a String	[无]	C
2711	Difference of Number of Distinct Values on Diagonals	[无]	C
2712	Minimum Cost to Make All Characters Equal	[无]	C
2713	Maximum Strictly Increasing Cells in a Matrix	[无]	C
2714	Find Shortest Path with K Hops	[无]	C
2715	JavaScript Problem	-	-	-	-
2716	Minimize String Length	[无]	C
2717	Semi-Ordered Permutation	[无]	C
2718	Sum of Matrix After Queries	[无]	C
2719	Count of Integers	[无]	C
2720	Database Problem: Link	-	-	-	-
2721	JavaScript Problem	-	-	-	-
2722	JavaScript Problem	-	-	-	-
2723	JavaScript Problem	-	-	-	-
2724	JavaScript Problem	-	-	-	-
2725	JavaScript Problem	-	-	-	-
2726	JavaScript Problem	-	-	-	-
2727	JavaScript Problem	-	-	-	-
2728	Count Houses in a Circular Street	[无]	C
2729	Check if The Number is Fascinating	[无]	C
2730	Find the Longest Semi-Repetitive Substring	[无]	C
2731	Movement of Robots	[无]	C
2732	Find a Good Subset of the Matrix	[无]	C
2733	Neither Minimum nor Maximum	[无]	C
2734	Lexicographically Smallest String After Substring Operation	[无]	C
2735	Collecting Chocolates	[无]	C
2736	Maximum Sum Queries	[无]	C
2737	Find the Closest Marked Node	[无]	C
2738	Database Problem: Link	-	-	-	-
2739	Total Distance Traveled	[无]	C
2740	Find the Value of the Partition	[无]	C
2741	Special Permutations	[无]	C
2742	Painting the Walls	[无]	C
2743	Count Substrings Without Repeating Character	[无]	C
2744	Find Maximum Number of String Pairs	[无]	C
2745	Construct the Longest New String	[无]	C
2746	Decremental String Concatenation	[无]	C
2747	Count Zero Request Servers	[无]	C
2748	Number of Beautiful Pairs	[无]	C
2749	Minimum Operations to Make the Integer Zero	[无]	C
2750	Ways to Split Array Into Good Subarrays	[无]	C
2751	Robot Collisions	[无]	C
2752	Database Problem: Link	-	-	-	-

2754	JavaScript Problem	-	-	-	-
2755	JavaScript Problem	-	-	-	-
2756	JavaScript Problem	-	-	-	-
2757	JavaScript Problem	-	-	-	-
2758	JavaScript Problem	-	-	-	-
2759	JavaScript Problem	-	-	-	-
2760	Longest Even Odd Subarray With Threshold	[无]	C
2761	Prime Pairs With Target Sum	[无]	C
2762	Continuous Subarrays	[无]	C
2763	Sum of Imbalance Numbers of All Subarrays	[无]	C

2849	Determine if a Cell Is Reachable at a Given Time	[无]	C

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0501-1000		0501-1000
1001-1500		1001-1500
1501-2000		1501-2000
2001-2500		2001-2500
2501-3000		2501-3000
Coding-Interviews		Coding-Interviews
Cracking-The-Coding-Interview		Cracking-The-Coding-Interview
LC		LC
Others		Others
.gitignore		.gitignore
qrcode.png		qrcode.png
readme.md		readme.md
zsxq.jpg		zsxq.jpg

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