Ada Bishop 2

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Ada is training for her match against Magnus Carlsen in the World Chess Championship 2020. Ada took a standard [chessboard](https://en.wikipedia.org/wiki/Chessboard) with $8$ rows (numbered $1$ through $8$) and $8$ columns (numbered $1$ through $8$); let's denote a cell in row $r$ and column $c$ by $(r, c)$. Then, Ada placed a [bishop](https://en.wikipedia.org/wiki/Bishop_(chess)) in a cell $(r_0

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solution.cppC++17

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