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
Tell me the slope
Roll the Dice!
Rotate a Matrix by 90 degrees
Check if there are white spaces in the input string
Capitalized string operations
Percentage of zeros in a matrix of only 1s and 0s
Product of all elements in an array
count upper and lower case characters
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