Hardest Advent of Code 2020 Problem (day 20 Jigsaw, backtracking)
Errichto Algorithms · 11:05
Advent of Code 2020 Day 20, "Jurassic Jigsaw" (called "Jurassic Puzzle" in the transcript), was the hardest puzzle of that year. Part 1 needs no assembly at all: corner tiles are simply the ones that match exactly two...