wsjcpp install https://github.com/sea-kg/sea5kgSudoku:master

$ ./build_simple.sh

$ ./sea5kgSudoku solve "123456" "6x6" "--3-1-56-32--542-32-645--12-45-4-1--"
Sudoku (input):
  --- --- --- --- --- --- 
 | - | - | 3 | - | 1 | - | 
 | 5 | 6 | - | 3 | 2 | - | 
 | - | 5 | 4 | 2 | - | 3 | 
 | 2 | - | 6 | 4 | 5 | - | 
 | - | 1 | 2 | - | 4 | 5 | 
 | - | 4 | - | 1 | - | - | 
  --- --- --- --- --- --- 
Sudoku (solved):
  --- --- --- --- --- --- 
 | 4 | 2 | 3 | 5 | 1 | 6 | 
 | 5 | 6 | 1 | 3 | 2 | 4 | 
 | 1 | 5 | 4 | 2 | 6 | 3 | 
 | 2 | 3 | 6 | 4 | 5 | 1 | 
 | 3 | 1 | 2 | 6 | 4 | 5 | 
 | 6 | 4 | 5 | 1 | 3 | 2 | 
  --- --- --- --- --- --- 
Input: --3-1-56-32--542-32-645--12-45-4-1--
Solved: 423516561324154263236451312645645132

$ ./sea5kgSudoku solve "123456789" "9x9" \
    "--7--5--2-86-3-9---5--7------4--8---89-----75---1--3------2--6---8-6-71-3--9--8--"
Sudoku (input):
  --- --- --- --- --- --- --- --- --- 
 | - | - | 7 | - | - | 5 | - | - | 2 | 
 | - | 8 | 6 | - | 3 | - | 9 | - | - | 
 | - | 5 | - | - | 7 | - | - | - | - | 
 | - | - | 4 | - | - | 8 | - | - | - | 
 | 8 | 9 | - | - | - | - | - | 7 | 5 | 
 | - | - | - | 1 | - | - | 3 | - | - | 
 | - | - | - | - | 2 | - | - | 6 | - | 
 | - | - | 8 | - | 6 | - | 7 | 1 | - | 
 | 3 | - | - | 9 | - | - | 8 | - | - | 
  --- --- --- --- --- --- --- --- --- 
Sudoku (solved):
  --- --- --- --- --- --- --- --- --- 
 | 9 | 4 | 7 | 6 | 8 | 5 | 1 | 3 | 2 | 
 | 2 | 8 | 6 | 4 | 3 | 1 | 9 | 5 | 7 | 
 | 1 | 5 | 3 | 2 | 7 | 9 | 4 | 8 | 6 | 
 | 6 | 3 | 4 | 7 | 5 | 8 | 2 | 9 | 1 | 
 | 8 | 9 | 1 | 3 | 4 | 2 | 6 | 7 | 5 | 
 | 5 | 7 | 2 | 1 | 9 | 6 | 3 | 4 | 8 | 
 | 7 | 1 | 9 | 8 | 2 | 4 | 5 | 6 | 3 | 
 | 4 | 2 | 8 | 5 | 6 | 3 | 7 | 1 | 9 | 
 | 3 | 6 | 5 | 9 | 1 | 7 | 8 | 2 | 4 | 
  --- --- --- --- --- --- --- --- --- 
Input: --7--5--2-86-3-9---5--7------4--8---89-----75---1--3------2--6---8-6-71-3--9--8--
Solved: 947685132286431957153279486634758291891342675572196348719824563428563719365917824

#include <sea5kgSudoku.h>

...

sea5kgSudoku sudoku("123456789", SEA5KG_SUDOKU_9x9);
sudoku.setData("--7--5--2-86-3-9---5--7------4--8---89-----75---1--3------2--6---8-6-71-3--9--8--");

sudoku.solve();

// solution maybe incomplete (!)
std::cout << "Solution:" << std::endl << sudoku.printData() << std::endl;

std::cout << sData << std::endl;
std::cout << sudoku.getOnelineData() << std::endl;
std::cout << "\n";