Comment by petercooper

APL is the language I only ever see around AoC. But it's so impressive too. Like the first part of today's solution is "+/¯1↓x<1⊖x" (stolen from someone on Reddit) and I'm like.. ok, I need to learn this language one day.

(Since their solution is now being discussed, it's from here: https://www.reddit.com/r/adventofcode/comments/r66vow/2021_d...)