Find the fourier transform of a given input vector
for ex a=[1 2 3 4]
then y=[ 10.0000 + 0.0000i -2.0000 + 2.0000i -2.0000 + 0.0000i -2.0000 - 2.0000i]
Project Euler: Problem 2, Sum of even Fibonacci
Perfect Square or not
Flip the bit
Concatenate two strings
Find out total non zero element of matrix
Area of a circle
Maximum value in a matrix
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