I’ve been participating regularly in Advent of Code for the past couple of years. It’s one of the highlights of my holiday season. The puzzles are fun, the stories are appropriately ridiculous, and it’s a neat way for me to keep the cobwebs brushed off some of the things I learned years ago that I don’t regularly use. Every year there are puzzles that take me a couple of minutes to solve, and puzzles that take me hours: I will forever curse the Intcode puzzles from 2019.
Last night’s puzzle was something new. The problem itself was pretty straight-forward (finding values that are common in multiple collections), but it resulted in a 45-minute debugging session that culminated in finding a bug in Swift’s implementation of
Source: Adventures in Advent of Code, an article by Dave DeLong.