Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Return a list sorted by number of occurrences
Sums with Excluded Digits
Back to basics 25 - Valid variable names
Generate a vector like 1,2,2,3,3,3,4,4,4,4
Element by element multiplication of two vectors
Sorted highest to lowest?
Size of this cup?
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