If the input is a negative number, generate an error. Otherwise, return the number.
Project Euler: Problem 6, Natural numbers, squares and sums.
Back to basics 12 - Input Arguments
Basic arrays operations.
Min of a Matrix
Calculate a modified Levenshtein distance between two strings
Find the maximal cliques in an undirected graph
Find similar/related functions
The Python Challenge, Level 1: Decode strings
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