Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
It dseon't mettar waht oedrr the lrettes in a wrod are.
Back to basics 11 - Max Integer
Return elements unique to either input
Matrix indexing with two vectors of indices
Given a number N, find the smallest prime P>N
Inner product of two vectors
Check if sorted
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