In file "sudoku.dat" is 9x9 size matrix. In one 3x3 bloc, can be from 2 up to 6 unknew digits, however main unknow digits amount in all matrix, must be not over 36 digits.
Unknow places marked with symbol ?
Example (3x3)
?9?
4??
?32
I need program which could write, does mentioned matrix has solution according by by traditional sudoku rules, if yes solve that sudoku.
Thanks