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README.md

Advent of Code 2021

This folder contains solutions to each of the problems in Advent of Code 2021 in C++.

Note

  • The sample puzzles for some days (eg 12, 16) multiple sample inputs. Edit the file before using it.
  • For simplicity the sample input for day 18 only contains the final sample input.
  • The sample input for day 24 is not a sample puzzle but a way to check some logic that might be required for the puzzle
Puzzle C++ Solutions Input Sample Input Puzzle page with solutions
Day 1: Sonar Sweep Part 1 Part 2 Link Link Link
Day 2: Dive! Part 1 Part 2 Link Link Link
Day 3: Binary Diagnostic Part 1 Part 2 Link Link Link
Day 4: Giant Squid Part 1 Part 2 Link Link Link
Day 5: Hydrothermal Venture Part 1 Part 2 Link Link Link
Day 6: Lanternfish Part 1 Part 2 Link Link Link
Day 7: The Treachery of Whales Part 1 Part 2 Link Link Link
Day 8: Seven Segment Search Part 1 Part 2 Link Link Link
Day 9: Smoke Basin Part 1 Part 2 Link Link Link
Day 10: Syntax Scoring Part 1 Part 2 Link Link Link
Day 11: Dumbo Octopus Part 1 Part 2 Link Link Link
Day 12: Passage Pathing Part 1 Part 2 Link Link Link
Day 13: Transparent Origami Part 1 Part 2 Link Link Link
Day 14: Extended Polymerization Part 1 Part 2 Link Link Link
Day 15: Chiton Part 1 Part 2 Link Link Link
Day 16: Packet Decoder Part 1 Part 2 Link Link Link
Day 17: Trick Shot Part 1 Part 2 Link Link Link
Day 18: Snailfish Part 1 Part 2 Link Link Link
Day 19: Beacon Scanner Part 1 Part 2 Link Link Link
Day 20: Trench Map Part 1 Part 2 Link Link Link
Day 21: Dirac Dice Part 1 Part 2 Link Link Link
Day 22: Reactor Reboot Part 1 Part 2 Link Link Link
Day 23: Amphipod Part 1 Part 2 Link Link Link
Day 24: Arithmetic Logic Unit Part 1 Part 2 Link Link Link
Day 25: Sea Cucumber Part 1 Link Link Link