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.
Make one big string out of two smaller strings
Fill a zeros matrix
Find the index of the largest value in any vector X=[4,3,4,5,9,12,0,4.....5]
Change the sign of even index entries of the reversed vector
Insert zeros into vector
Remove entire row and column in the matrix containing the input values
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