Advent of Code - Puzzle List
Done?
Year
Day
Title
Topics
+
2015
1
Not Quite Lisp
+
2015
2
I Was Told There Would Be No Math
+
2015
3
Perfectly Spherical Houses in a Vacuum
walk simulation
+
2015
4
The Ideal Stocking Stuffer
+
2015
5
Doesn't He Have Intern-Elves For This?
string validation
+
2015
6
Probably a Fire Hazard
+
2015
7
Some Assembly Required
circuit emulation, tree graph
+
2015
8
Matchsticks
+
2015
9
All in a Single Night
permutations, Heap's algorithm, Hamiltonian paths, graph
+
2015
10
Elves Look, Elves Say
Conway's look-and-say sequence, simulation
+
2015
11
Corporate Policy
string validation
+
2015
12
JSAbacusFramework .io
recursive walk of json object
+
2015
13
Knights of the Dinner Table
permutations, Heap's algorithm, Hamiltonian circle, graph
+
2015
14
Reindeer Olympics
+
2015
15
Science for Hungry People
+
2015
16
Aunt Sue
find matching object based on properties
+
2015
17
No Such Thing as Too Much
combinations
+
2015
18
Like a GIF For Your Yard
Conway's Game of Life, simulation
+
2015
19
Medicine for Rudolph
DFS, graph
+
2015
20
Infinite Elves and Infinite Houses
prime factorization, sigma function, sum-of-divisors func
+
2015
21
RPG Simulator 20XX
game simulation
+
2015
22
Wizard Simulator 20XX
game simulation, DFS, graph, priority queue
+
2015
23
Opening the Turing Lock
assembly simulation
+
2015
24
It Hangs in the Balance
+
2015
25
Let It Snow
LCG, linear congruence
Hint from subreddit was used for Day 19.
Done?
Year
Day
Title
Topics
+
2016
1
No Time for a Taxicab
+
2016
2
Bathroom Security
walk simulation
+
2016
3
Squares With Three Sides
+
2016
4
Security Through Obscurity
+
2016
5
How About a Nice Game of Chess?
+
2016
6
Signals and Noise
+
2016
7
Internet Protocol Version 7
+
2016
8
Two-Factor Authentication
simulation
+
2016
9
Explosives in Cyberspace
-
2016
10
Balance Bots
bot simulation
-
2016
11
Radioisotope Thermoelectric Generators
BFS, beam search
-
2016
12
Leonardo's Monorail
assembly simulation
-
2016
13
A Maze of Twisty Little Cubicles
BFS
-
2016
14
One-Time Pad
-
2016
15
Timing is Everything
Chinese Remainder Theorem
-
2016
16
Dragon Checksum
-
2016
17
Two Steps Forward
BFS
-
2016
18
Like a Rogue
+
2016
19
An Elephant Named Joseph
Josephus problem
-
2016
20
Firewall Rules
-
2016
21
Scrambled Letters and Hash
-
2016
22
Grid Computing
-
2016
23
Safe Cracking
assembly simulation
-
2016
24
Air Duct Spelunking
BFS
-
2016
25
Clock Signal
assembly simulation
Hint from subreddit was used for Day 19.
Done?
Year
Day
Title
Topics
+
2017
1
Inverse Captcha
+
2017
2
Corruption Checksum
+
2017
3
Spiral Memory
+
2017
4
High-Entropy Passphrases
+
2017
5
A Maze of Twisty Trampolines, All Alike
+
2017
6
Memory Reallocation
+
2017
7
Recursive Circus
tree graph, recursion
+
2017
8
I Heard You Like Registers
assembly simulation
+
2017
9
Stream Processing
parsing, state machine
+
2017
10
Knot Hash
+
2017
11
Hex Ed
walking simulation on hex grid
+
2017
12
Digital Plumber
graph, BFS, components
+
2017
13
Packet Scanners
+
2017
14
Disk Defragmentation
flood fill
+
2017
15
Dueling Generators
+
2017
16
Permutation Promenade
simulation, cycle detection
+
2017
17
Spinlock
circular linked list
+
2017
18
Duet
assembly simulation, coroutines
+
2017
19
A Series of Tubes
walking simulation
+
2017
20
Particle Swarm
simulation
+
2017
21
Fractal Art
image transformation
+
2017
22
Sporifica Virus
walking simulation
+
2017
23
Coprocessor Conflagration
assembly simulation
+
2017
24
Electromagnetic Moat
BFS
+
2017
25
The Halting Problem
Turing machine
Hint from subreddit was used for Day 23 Part 2.
Done?
Year
Day
Title
Topics
+
2018
1
Chronal Calibration
-
2018
2
Inventory Management System
-
2018
3
No Matter How You Slice It
-
2018
4
Repose Record
-
2018
5
Alchemical Reduction
-
2018
6
Chronal Coordinates
-
2018
7
The Sum of Its Parts
job scheduling
-
2018
8
Memory Maneuver
tree graph
-
2018
9
Marble Mania
circular linked list
-
2018
10
The Stars Align
simulation
-
2018
11
Chronal Charge
dynamic programming, sum of rectangle grid
-
2018
12
Subterranean Sustainability
simulation, cycle detection
-
2018
13
Mine Cart Madness
walk simulation
-
2018
14
Chocolate Charts
-
2018
15
Beverage Bandits
game simulation
-
2018
16
Chronal Classification
assembly simulation, matching in bipartite graph
-
2018
17
Reservoir Research
simulation
-
2018
18
Settlers of The North Pole
Conway's Game of Life, simulation, cycle detection
-
2018
19
Go With The Flow
assembly simulation, reverse engineering
-
2018
20
A Regular Map
BFS, string parsing
-
2018
21
Chronal Conversion
assembly simulation, reverse engineering
-
2018
22
Mode Maze
pathfinding, A-Star (A*)
-
2018
23
Experimental Emergency Teleportation
priority queue
-
2018
24
Immune System Simulator 20XX
string parsing, game simulation
-
2018
25
Four-Dimensional Adventure
BFS, graph components
Hint from subreddit was used for Day 23 part 2.
Done?
Year
Day
Title
Topics
+
2019
1
The Tyranny of the Rocket Equation
-
2019
2
1202 Program Alarm
assembly simulation
-
2019
3
Crossed Wires
walking simulation
-
2019
4
Secure Container
-
2019
5
Sunny with a Chance of Asteroids
assembly simulation
-
2019
6
Universal Orbit Map
tree graph
-
2019
7
Amplification Circuit
concurrent simulation, permutations, Heap's algorithm
-
2019
8
Space Image Format
-
2019
9
Sensor Boost
assembly simulation
-
2019
10
Monitoring Station
-
2019
11
Space Police
assembly simulation
-
2019
12
The N-Body Problem
simulation
-
2019
13
Care Package
assembly simulation, game simulation
-
2019
14
Space Stoichiometry
binary search
-
2019
15
Oxygen System
assembly simulation, BFS
-
2019
16
Flawed Frequency Transmission
-
2019
17
Set and Forget
assembly simulation
-
2019
18
Many-Worlds Interpretation
BFS
-
2019
19
Tractor Beam
assembly simulation
-
2019
20
Donut Maze
parsing, BFS
-
2019
21
Springdroid Adventure
assembly simulation (with camera output)
-
2019
22
Slam Shuffle
card deck simulation, modular arithmetics, LCF
-
2019
23
Category Six
assembly simulation
-
2019
24
Planet of Discord
-
2019
25
Cryostasis
assembly simulation, interactive fiction
Hint from subreddit was used for Day 14, 16, 18, 21 and 22 (all for part 2 only).
Done?
Year
Day
Title
Topics
+
2020
1
Report Repair
-
2020
2
Password Philosophy
string validation
-
2020
3
Toboggan Trajectory
-
2020
4
Passport Processing
input parsing, object validation
-
2020
5
Binary Boarding
-
2020
6
Custom Customs
-
2020
7
Handy Haversacks
input parsing
-
2020
8
Handheld Halting
assembly simulation
-
2020
9
Encoding Error
-
2020
10
Adapter Array
recursion, memoization
-
2020
11
Seating System
Conway's Game of Life, simulation
-
2020
12
Rain Risk
walk simulation
-
2020
13
Shuttle Search
Chinese Remainder Theorem, Bézout coefficients, GCD, extended Euclidean algorithm
-
2020
14
Docking Data
assembly simulation
-
2020
15
Rambunctious Recitation
-
2020
16
Ticket Translation
input parsing, object validation
-
2020
17
Conway Cubes
Conway's Game of Life, simulation
-
2020
18
Operation Order
math expression evaluation
-
2020
19
Monster Messages
context-free grammar, CFG with limited loops
-
2020
20
Jurassic Jigsaw
image transformation, image matching
-
2020
21
Allergen Assessment
bipartite graph, matching
-
2020
22
Crab Combat
game simulation, recursion
-
2020
23
Crab Cups
game simulation
-
2020
24
Lobby Layout
walking simulation on hex grid, Conway's Game of Life
-
2020
25
Combo Breaker
asymmetric key encryption
Hint from subreddit was used for Day 23.
Done?
Year
Day
Title
Topics
+
2021
1
Sonar Sweep
-
2021
2
Dive!
walking simulation
-
2021
3
Binary Diagnostic
-
2021
4
Giant Squid
Bingo simulation
-
2021
5
Hydrothermal Venture
-
2021
6
Lanternfish
simulation
-
2021
7
The Treachery of Whales
-
2021
8
Seven Segment Search
-
2021
9
Smoke Basin
-
2021
10
Syntax Scoring
-
2021
11
Dumbo Octopus
simulation
-
2021
12
Passage Pathing
DFS
-
2021
13
Transparent Origami
-
2021
14
Extended Polymerization
-
2021
15
Chiton
pathfinding, A-Star (A*)
-
2021
16
Packet Decoder
parsing
-
2021
17
Trick Shot
simulation
-
2021
18
Snailfish
binary tree
-
2021
19
Beacon Scanner
vector, matrix, rotations
-
2021
20
Trench Map
Conway's Game of Life, simulation
-
2021
21
Dirac Dice
-
2021
22
Reactor Reboot
-
2021
23
Amphipod
Dijkstra, priority queue
-
2021
24
Arithmetic Logic Unit
assembly reverse engineering
-
2021
25
Sea Cucumber
No external hint was used in this season.
Done?
Year
Day
Title
Topics
+
2022
1
Calorie Counting
-
2022
2
Rock Paper Scissors
-
2022
2
Rucksack Reorganization
-
2022
4
Camp Cleanup
-
2022
5
Supply Stacks
-
2022
6
Tuning Trouble
-
2022
7
No Space Left On Device
-
2022
8
Treetop Tree House
-
2022
9
Rope Bridge
walk simulation
-
2022
10
Cathode-Ray Tube
assembly simulation
-
2022
11
Monkey in the Middle
game simulation
-
2022
12
Hill Climbing Algorithm
BFS
-
2022
13
Distress Signal
parsing of recursive list, custom compare
-
2022
14
Regolith Reservoir
-
2022
15
Beacon Exclusion Zone
rectangle difference
-
2022
16
Proboscidea Volcanium
beam search
-
2022
17
Pyroclastic Flow
Tetris simulation, cycle detection
-
2022
18
Boiling Boulders
flood fill
-
2022
19
Not Enough Minerals
beam search
-
2022
20
Grove Positioning System
circular linked list
-
2022
21
Monkey Math
tree graph, math expression evaluation
-
2022
22
Monkey Map
walking simulation, cube geometry
-
2022
23
Unstable Diffusion
walking simulation
-
2022
24
Blizzard Basin
BFS
-
2022
25
Full of Hot Air
balanced 5-ary numbers
No external hint was used in this season.
Done?
Year
Day
Title
Topics
+
2023
1
Trebuchet?!
+
2023
2
Cube Conundrum
+
2023
3
Gear Ratios
+
2023
4
Scratchcards
+
2023
5
If You Give A Seed A Fertilizer
+
2023
6
Wait For It
+
2023
7
Camel Cards
Poker hands
+
2023
8
Haunted Wasteland
cycle detection, least common multiple
+
2023
9
Mirage Maintenance
recursion
+
2023
10
Pipe Maze
enclosed area in loop path
+
2023
11
Cosmic Expansion
+
2023
12
Hot Springs
recursion, memoization
+
2023
13
Point of Incidence
+
2023
14
Parabolic Reflector Dish
cycle detection
+
2023
15
Lens Library
+
2023
16
The Floor Will Be Lava
BFS
+
2023
17
Clumsy Crucible
Dijkstra, priority queue
+
2023
18
Lavaduct Lagoon
BFS
+
2023
19
Aplenty
+
2023
20
Pulse Propagation
simulation, cycle detection, priority queue
+
2023
21
Step Counter
BFS
+
2023
22
Sand Slabs
simulation
+
2023
23
A Long Walk
DFS, BFS, maze compression
+
2023
24
Never Tell Me The Odds
line intersection
+
2023
25
Snowverload
graph components
Hint from subreddit was used for Day 12 part 2, Day 24 part 2 and Day 25.
Done?
Year
Day
Title
Topics
+
2024
1
Historian Hysteria
+
2024
2
Red-Nosed Reports
+
2024
3
Mull It Over
parsing
+
2024
4
Ceres Search
+
2024
5
Print Queue
+
2024
6
Guard Gallivant
+
2024
7
Bridge Repair
permutation
+
2024
8
Resonant Collinearity
+
2024
9
Disk Fragmenter
+
2024
10
Hoof It
BFS
+
2024
11
Plutonian Pebbles
recursion, memoization
+
2024
12
Garden Groups
+
2024
13
Claw Contraption
+
2024
14
Restroom Redoubt
+
2024
15
Warehouse Woes
walking simulation, box moving
+
2024
16
Reindeer Maze
Dijkstra, priority queue
+
2024
17
Chronospatial Computer
assembly simulation, reverse engineering
+
2024
18
RAM Run
BFS
+
2024
19
Linen Layout
BinaryHeap
+
2024
20
Race Condition
+
2024
21
Keypad Conundrum
recursion, memoization
+
2024
22
Monkey Market
+
2024
23
LAN Party
graph, maximum clique, Bron–Kerbosch algorithm
+
2024
24
Crossed Wires
graph, logic circuit simulation, reverse engineering
+
2024
25
Code Chronicle
Hint from subreddit was used for Day 14 part 2 (what shape to look for).
