Q1: Write a function to swap the elements above and below the first diagonal of a two-dimensional array. Ex: Input array output array 2 3 4 5 6 11 16 21 7 9 10 2 7 12 17 22 12 13 14 15 3 8 13 18 23 11 16 17 18 19 20 4 9 14 19 24 21 22 23 24 25 5 10 15 20 25

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A: C++ implementation is given below

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