advent-of-code-2021 Solutions Day 1: Sonar Sweep Day 2: Dive! Day 3: Binary Diagnostic Day 4: Giant Squid Day 5: Hydrothermal Venture Day 6: Lanternfish Day 7: The Treachery of Whales Day 8: Seven Segment Search Day 9: Smoke Basin Day 10: Syntax Scoring Day 11: Dumbo Octopus Day 12: Passage Pathing Day 13: Transparent Origami