let wolf() make one or two steps to get a feel of the beat, it is waltz, do not let wolf() make the third step, return safely just before the third beat should fall, do not be too fast or too slow.
Select every other element of a vector
Rotate input square matrix 90 degrees CCW without rot90
Looking for Squares
Given an unsigned integer x, find the largest y by rearranging the bits in x
Acidity of vinegar and salts
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