As a heads up, http://oeis.org/A138591 counts 1 as a polite number, but the test suite does not.
letter yes yes & letter no no
We love vectorized solutions. Problem 1 : remove the row average.
Compare two input matrices
Find the 9's Complement
Calculate the Damerau-Levenshtein distance between two strings.
Which permutation is it?
(Linear) Recurrence Equations - Generalised Fibonacci-like sequences
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