Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Which values occur exactly three times?
Find a subset that divides the vector into equal halves
Fill a zeros matrix
Detect a number and replace with two NaN's
Product of elements in row
Person of interest?
Given a square and a circle, please decide whether the square covers more area.
Check if any duplicates in your data
Multiply a column by a row
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