Angled Flip

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You are given two $N \times M$ integer matrices $A$ and $B$. You are allowed to perform the following operation on $A$ as many times as you like (possibly, zero): - Pick any square submatrix of $A$ and flip it about either its [main diagonal or its antidiagonal](https://en.wikipedia.org/wiki/Main_diagonal). For example, suppose you choose the submatrix $ \begin{bmatrix} 1 \;\;\;\; 2 \;\;\;\; 3 \

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solution.cppC++17

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