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.
Counting in Finnish
Check to see if a Sudoku Puzzle is Solved
Least common multiple of many numbers
Find the sum of the elements in the "second" diagonal
Sum of series IV
Sum of series VI
Sum of series II
Sum of series I
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