java sudoku solver
for (int row = 0; row < SIZE; row++) {
for (int col = 0; col < SIZE; col++) {
// we search an empty cell
if (board[row][col] == EMPTY) {
// we try possible numbers
for (int number = 1; number <= SIZE; number++) {
if (isOk(row, col, number)) {
// number ok. it respects sudoku constraints
board[row][col] = number;
if (solve()) { // we start backtracking recursively
return true;
} else { // if not a solution, we empty the cell and we continue
board[row][col] = EMPTY;
}
}
}
return false; // we return false
}
}
}
return true; // sudoku solved