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
Test for balanced parentheses
Make a run-length companion vector
Find the logic
Reverse a matrix
prime test 2
surface areas of a cylinder
Sum of unique multiples of 3 and 5
convert the number to binary format & count digits
Remove white spaces at the end of the input string
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