this problem could use some nontrivial testcases
Filter AC, pass DC
Is my wife right? Now with even more wrong husband
Numbers with prime factors 2, 3 and 5.
Return the first and last characters of a character array
Given an unsigned integer x, find the largest y by rearranging the bits in x
Given a number N, find the smallest prime P>N
Multiply a column by a row
old wine in a new bottle?
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