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advent-of-code-2020's Introduction

Advent of Code 2020

This repository is now superseded by alexander-held/advent-of-code.

Solutions to Advent of Code 2020 puzzles: https://adventofcode.com/2020.

What is each day about?

  • 01: finding values summing to specific number in list
  • 02: password parsing, applying rules to determine valid passwords
  • 03: 2d grid navigation, counting trees hit when taking different paths
  • 04: passport parsing, input parsing and rule application
  • 05: boarding pass parsing, base-2 math
  • 06: customs forms, set unions and intersections
  • 07: bags contained inside bags following rules / memoization
  • 08: running game console code to calculate number, changing one instruction to make code terminate
  • 09: subset of numbers in list that follows rules
  • 10: adapter array to charge device, finding all possible configurations / dynamic programming
  • 11: 2d cellular automaton: seat assignments
  • 12: 2d grid navigation
  • 13: coinciding bus departure times, least common multiple with offsets / Chinese remainder theorem
  • 14: program with bitmasks
  • 15: evaluating n-th number following game where next number depends on history
  • 16: matching rules to list of examples following rules in unknown order to determine order of rules in example
  • 17: 3d and 4d cellular automata
  • 18: expression parsing with custom operator precedence
  • 19: counting messages satisfying rules with loops / context-free grammar
  • 20: arranging puzzle pieces to solve puzzle, finding sea monster in solved image
  • 21: matching allergens to ingredients in list of food items / bipartite matching
  • 22: playing 2-player card game with recursion
  • 23: circle cup game / linked list
  • 24: hexagonal grid navigation / cellular automaton
  • 25: finding encryption key of handshake

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