Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Make a checkerboard matrix
Remove all the consonants
Remove the small words from a list of words.
Replacing a row
swap sign sum & multiply castles
chance in percent for minimum K heads when a good coin is tossed N times?
Given an unsigned integer x, find the largest y by rearranging the bits in x
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