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Advent of Code 2019

I've been lured into participating in Advent of Code 2019, a programming contest/challenge that presents a two-part puzzle each day during December until Christmas proper, just like an advent calendar.

I like the concept because it can be as competitive as you like (in my case, not at all) and you don't have to complete one day's puzzle to be able to see the next one - although they are sometimes dependent on having solved earlier puzzles.

A bit of code

Warning: This code is "as-is", complete with wonky formatting, glaring flaws, messy design and spurious comments.