Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Increment a number, given its digits
Find the "ordinary" or Euclidean distance between A and Z
Back to basics 25 - Valid variable names
Reindex a vector
find the surface area of a cube
Given n, create n random numbers such that their standard deviation is also n.
area of an annulus
Check if sorted
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