Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Given an unsigned integer x, find the largest y by rearranging the bits in x
Rotate and display numbered tile
Cell Counting: How Many Draws?
Area of an equilateral triangle
Check that number is whole number
Sorted highest to lowest?
Minimum possible M of the maximum side of a triangle of given area A.
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