Difference of diagonals

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Problem description. Given a square matrix of size N*N calculate the absolute difference between the sums of its diagonals. Input The first line contains a single integer, N . The next N lines denote the matrix's rows, with each line containing N space-separated integers describing the columns. Output Print the absolute difference between the two sums of the matrix's diagonals as a single int

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solution.cppC++17

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