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.
Who knows the last digit of pi?
Who invented zero?
Flip the vector from right to left
Change the sign of even index entries of the reversed vector
Symmetry of vector
Insert zeros into vector
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