Duplicate a character 'n' times.
Example 1: str='a' n=5
Example 2: str='*' n=3
n is a nonnegative interger.may it be the largest problem that i meet.
My initial solution with repelem(str,n) for n=0 creates a size 1x0 char class but suite only allows for a 0x0 class. Not sure why the difference would matter.
Return a list sorted by number of occurrences
Getting the indices from a matrice
Find out sum of all elements of given Matrix
Sort complex numbers into complex conjugate pairs
Change the sign of even index entries of the reversed vector
Symmetry of vector
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