This is a C++ implementation of Donald Knuth's Algorithm X using the Dancing Links technique(DLX Algorithm).
- Dr Knuth's Dancing Links Paper: http://www.ocf.berkeley.edu/~jchu/publicportal/sudoku/0011047.pdf
- Jonathan Chu's detailed explanation on turning a Sudoku grid into an exact cover problem: https://www.ocf.berkeley.edu/~jchu/publicportal/sudoku/sudoku.paper.html