Manhattan Xor

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There is an $N\times M$ grid. The rows are numbered $1$ to $N$ from top to bottom and columns are numbered $1$ to $M$ from left to right. Alice is at coordinate $(X,Y)$. Alice needs to calculate the [bitwise XOR](https://en.wikipedia.org/wiki/Bitwise_operation#XOR) of *Manhattan distances* of all the coordinates in the grid from the point $(X,Y)$. Note that *Manhattan distance* between points $(

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solution.cppC++17

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