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
Return a list sorted by number of occurrences
Rotate a Matrix
Determine Whether an array is empty
The Answer to Life, the Universe, and Everything
Divide by 4
Basic Quadratic Equation
Repetition of matrices
find number of times of occurrence of the most frequent number in a row vector
Capitalized string operations
ASCII sum of phrases
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