Generate a list of all unique Tic Tac Toe boards

Question

I would like to generate a text file containing all 19,683 Tic-Tac-Toe board layouts in the structure of 0 = Blank, 1 = X, and 2 = O. Unfortunately math is not my strong su

Answer 1

You can simply brute force your way through. Each of the squares is 0, 1 or 2 so...:

for (int i1 = 0; i1 <= 2; i++) {
    for (int i2 = 0; i2 <= 2; i++) {
        // ...
        // lot's of nested for loops
        // ...
    }
}

Or, if you can't be bothered with that ;) then you can write a recursive function for it:

int square[9];
void place(int square_num) {
    if (square_num == 9) {
        output the current configuration
    }

    for (int i = 0; i <= 2; i++) {
        square[square_num] = i;
        place(square_num+1);
    }
}

Then just do:

place(0);

and magic will occur.

This is in c++ by the way.