This year's Advent of Code answers, written in Kotlin.

• Day 15 does not work.

After a lot of debugging, day 15 does not produce the right answer. The test cases pass, which means it's likely an error that's caused by a tiny error somewhere. Unfortunately, I can't find it, which means it's probably not going to produce the right answer. According to the subreddit, this challenge has caused a bunch of frustration for many people because of these one-off errors (a single calculation error can cause the wrong answer).

It passes the small tests because they're, as you'd expect from the name, small. There's less room for these types of errors to occur.