Create Alternate Solution

[shatanshu3006]

This is another solution for the CSES "ChessBoard and Queens" Problem.

[shatanshu3006]

Using Backtracking

Since the bounds are small, we can recursively backtrack over all ways to place
the queens, storing the current state of the board.

Then, we can try to place a queen at all squares $x, y$ if it isn't attacked by
a queen or blocked and recurse, before removing this queen and backtracking.

Finally, when we have placed all the queens and the board's state is valid, then
increment the answer.

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