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
intersection of matrices
Find out missing number from a vector of 9 elements
length of a vector
Sum of unique multiples of 3 and 5
Check if there are white spaces in the input string
Calculating the total earnings of a factory
Perimeter of a semicircle
surface areas of a cylinder
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