For given input matrix a, rotate it by 90 degrees and find the sum of the diagonals.
Example: Input:
a =
1 2 3 4 5 6 7 8 8 10 12 -2 -1 -3 -5 -7
Output is:
20
185 Solvers
191 Solvers
304 Solvers
264 Solvers
Sort the vector with the given index
77 Solvers
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