Solving Fizzbuzz using Euler's totient theorem rather than conditionals:
miniblog.
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TIL Advent of Code and Project Euler will deliberately look for puzzles where the naive solution is worse than quadratic.
This ensures that people can solve them with any programming language. You don't want fast languages to be able to use the naive solution.
Solving Fizzbuzz using Euler's totient theorem rather than conditionals: https://philcrissman.net/posts/eulers-fizzbuzz/