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
Bottles of beer
"Low : High - Low : High - Turn around " -- Create a subindices vector
Given area find sides
Basics: counting digits of a number irrespective of the sign
function to compute root mean square of first nn positive odd integers
Capitalized string operations
Remove white spaces at the end of the input string
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