As a heads up, http://oeis.org/A138591 counts 1 as a polite number, but the test suite does not.
Get the area codes from a list of phone numbers
High school cafeteria
Rotate a Matrix
Given a window, how many subsets of a vector sum positive
Make a full wave rectifier
Packing oranges - one layer
Pancakes for everyone!
Arithmetic/geometric sequence, 50/50
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