May I ask what is the definition of Nilpotent matrix. I suppose that is A^k =0 for some k? If I am right, then 0 must be an eigenvalue of A, then there is some issues for the test problems.
@Ling Liang , take some tolerance while checking the equality of eigen value with zero.
Find the sum of all the numbers of the input vector
Project Euler: Problem 9, Pythagorean numbers
Get the length of a given vector
Determine Whether an array is empty
Remove white space from the string
Sum of series I
Sum of series VI
Sum of series VII
Sum of series II
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