For given input matrix a, rotate it by 90 degrees and find the sum of the diagonals.
1 2 3 4
5 6 7 8
8 10 12 -2
-1 -3 -5 -7
First N Perfect Squares
Back to basics 9 - Indexed References
Replace May with April
Make a random, non-repeating vector.
Rounding off numbers to n decimals
Perimeter of a semicircle
Return median of a matrix
Day counter function
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