The tip here is averages. Catmull & Clark used them to smooth polyhedra for instance.
Encode Roman Numerals
Project Euler: Problem 3, Largest prime factor
Energy of a photon
Kryptos - CIA Cypher Sculpture: Vigenere Encryption
Hackathon: the beginnings
Knights and Knaves (part 3)
Fastest shortest-path-finder in the west
love is an n-letter word
singularity 2.0 (really hard)
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