Given input vector, output it's DC and AC value
input = 0 1 -1 0
ac = 0 1 -1 0
dc = 0
Making a judgement about AC & DC based on only four points is unreliable. Not quite as flawed as the test cases in Problem 125, but still could be improved.
Return the first and last character of a string
Sort the vector with the given index
length of a vector
Some tweaks in summation, Can you decode? :)
Beat the test suite if you can :)
Rotate matrix by -90 degrees
Upper Matrix in LU Decompositon
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