Binod and Matrix

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Binod loves matrices. He calls a matrix GOOD if 1. All elements of the matrix are [non-negative](https://en.wiktionary.org/wiki/non-negative#:~:text=non%2Dnegative%20(not%20comparable),Distances%20are%20non%2Dnegative.). 2. The matrix is a symmetric matrix. Binod got a square matrix of size $N * N$ as a gift from her girlfriend Binod. Now he wants to make this matrix GOOD. Binod can perform

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solution.cppC++17

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