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--- Day 17: Chronospatial Computer ---
The Historians push the button on their strange device, but this time, you all just feel like you're falling.
"Situation critical", the device announces in a familiar voice. "Bootstrapping process failed. Initializing debugger...."
The small handheld device suddenly unfolds into... | 200 |
--- Day 23: Unstable Diffusion ---
You enter a large crater of gray dirt where the grove is supposed to be. All around you, plants you imagine were expected to be full of fruit are instead withered and broken. A large group of Elves has formed in the middle of the grove.
"...but this volcano has been dormant for month... | 201 |
--- Day 23: A Long Walk ---
The Elves resume water filtering operations! Clean water starts flowing over the edge of Island Island.
They offer to help you go over the edge of Island Island, too! Just hold on tight to one end of this impossibly long rope and they'll lower you down a safe distance from the massive water... | 202 |
--- Day 17: Chronospatial Computer ---
The Historians push the button on their strange device, but this time, you all just feel like you're falling.
"Situation critical", the device announces in a familiar voice. "Bootstrapping process failed. Initializing debugger...."
The small handheld device suddenly unfolds into... | 203 |
--- Day 22: Monkey Map ---
The monkeys take you on a surprisingly easy trail through the jungle. They're even going in roughly the right direction according to your handheld device's Grove Positioning System.
As you walk, the monkeys explain that the grove is protected by a force field. To pass through the force field... | 204 |
--- Day 7: Internet Protocol Version 7 ---
While snooping around the local network of EBHQ, you compile a list of IP addresses (they're IPv7, of course; IPv6 is much too limited). You'd like to figure out which IPs support TLS (transport-layer snooping).
An IP supports TLS if it has an Autonomous Bridge Bypass Annotat... | 205 |
--- Day 8: Memory Maneuver ---
The sleigh is much easier to pull than you'd expect for something its weight. Unfortunately, neither you nor the Elves know which way the North Pole is from here.
You check your wrist device for anything that might help. It seems to have some kind of navigation system! Activating the nav... | 206 |
--- Day 2: Dive! ---
Now, you need to figure out how to pilot this thing.
It seems like the submarine can take a series of commands like forward 1, down 2, or up 3:
forward X increases the horizontal position by X units.
down X increases the depth by X units.
up X decreases the depth by X units.
Note that since you'r... | 207 |
--- Day 14: Parabolic Reflector Dish ---
You reach the place where all of the mirrors were pointing: a massive parabolic reflector dish attached to the side of another large mountain.
The dish is made up of many small mirrors, but while the mirrors themselves are roughly in the shape of a parabolic reflector dish, eac... | 208 |
--- Day 16: Aunt Sue ---
Your Aunt Sue has given you a wonderful gift, and you'd like to send her a thank you card. However, there's a small problem: she signed it "From, Aunt Sue".
You have 500 Aunts named "Sue".
So, to avoid sending the card to the wrong person, you need to figure out which Aunt Sue (which you conv... | 209 |
--- Day 21: Step Counter ---
You manage to catch the airship right as it's dropping someone else off on their all-expenses-paid trip to Desert Island! It even helpfully drops you off near the gardener and his massive farm.
"You got the sand flowing again! Great work! Now we just need to wait until we have enough sand ... | 210 |
--- Day 16: Packet Decoder ---
As you leave the cave and reach open waters, you receive a transmission from the Elves back on the ship.
The transmission was sent using the Buoyancy Interchange Transmission System (BITS), a method of packing numeric expressions into a binary sequence. Your submarine's computer has save... | 211 |
--- Day 19: Monster Messages ---
You land in an airport surrounded by dense forest. As you walk to your high-speed train, the Elves at the Mythical Information Bureau contact you again. They think their satellite has collected an image of a sea monster! Unfortunately, the connection to the satellite is having problems,... | 212 |
--- Day 24: Never Tell Me The Odds ---
It seems like something is going wrong with the snow-making process. Instead of forming snow, the water that's been absorbed into the air seems to be forming hail!
Maybe there's something you can do to break up the hailstones?
Due to strong, probably-magical winds, the hailstone... | 213 |
--- Day 9: Rope Bridge ---
This rope bridge creaks as you walk along it. You aren't sure how old it is, or whether it can even support your weight.
It seems to support the Elves just fine, though. The bridge spans a gorge which was carved out by the massive river far below you.
You step carefully; as you do, the rope... | 214 |
--- Day 4: Scratchcards ---
The gondola takes you up. Strangely, though, the ground doesn't seem to be coming with you; you're not climbing a mountain. As the circle of Snow Island recedes below you, an entire new landmass suddenly appears above you! The gondola carries you to the surface of the new island and lurches ... | 215 |
--- Day 14: Disk Defragmentation ---
Suddenly, a scheduled job activates the system's disk defragmenter. Were the situation different, you might sit and watch it for a while, but today, you just don't have that kind of time. It's soaking up valuable system resources that are needed elsewhere, and so the only option is ... | 216 |
--- Day 20: Infinite Elves and Infinite Houses ---
To keep the Elves busy, Santa has them deliver some presents by hand, door-to-door. He sends them down a street with infinite houses numbered sequentially: 1, 2, 3, 4, 5, and so on.
Each Elf is assigned a number, too, and delivers presents to houses based on that numb... | 217 |
--- Day 18: Many-Worlds Interpretation ---
As you approach Neptune, a planetary security system detects you and activates a giant tractor beam on Triton! You have no choice but to land.
A scan of the local area reveals only one interesting feature: a massive underground vault. You generate a map of the tunnels (your p... | 218 |
--- Day 10: Adapter Array ---
Patched into the aircraft's data port, you discover weather forecasts of a massive tropical storm. Before you can figure out whether it will impact your vacation plans, however, your device suddenly turns off!
Its battery is dead.
You'll need to plug it in. There's only one problem: the ... | 219 |
--- Day 5: If You Give A Seed A Fertilizer ---
You take the boat and find the gardener right where you were told he would be: managing a giant "garden" that looks more to you like a farm.
"A water source? Island Island is the water source!" You point out that Snow Island isn't receiving any water.
"Oh, we had to stop... | 220 |
--- Day 2: Password Philosophy ---
Your flight departs in a few days from the coastal airport; the easiest way down to the coast from here is via toboggan.
The shopkeeper at the North Pole Toboggan Rental Shop is having a bad day. "Something's wrong with our computers; we can't log in!" You ask if you can take a look.... | 221 |
--- Day 18: Duet ---
You discover a tablet containing some strange assembly code labeled simply "Duet". Rather than bother the sound card with it, you decide to run the code yourself. Unfortunately, you don't see any documentation, so you're left to figure out what the instructions mean on your own.
It seems like the ... | 222 |
--- Day 2: Inventory Management System ---
You stop falling through time, catch your breath, and check the screen on the device. "Destination reached. Current Year: 1518. Current Location: North Pole Utility Closet 83N10." You made it! Now, to find those anomalies.
Outside the utility closet, you hear footsteps and a ... | 223 |
--- Day 25: Snowverload ---
Still somehow without snow, you go to the last place you haven't checked: the center of Snow Island, directly below the waterfall.
Here, someone has clearly been trying to fix the problem. Scattered everywhere are hundreds of weather machines, almanacs, communication modules, hoof prints, m... | 224 |
--- Day 23: Crab Cups ---
The small crab challenges you to a game! The crab is going to mix up some cups, and you have to predict where they'll end up.
The cups will be arranged in a circle and labeled clockwise (your puzzle input). For example, if your labeling were 32415, there would be five cups in the circle; goin... | 225 |
--- Day 15: Chiton ---
You've almost reached the exit of the cave, but the walls are getting closer together. Your submarine can barely still fit, though; the main problem is that the walls of the cave are covered in chitons, and it would be best not to bump any of them.
The cavern is large, but has a very low ceiling... | 226 |
--- Day 2: Cube Conundrum ---
You're launched high into the atmosphere! The apex of your trajectory just barely reaches the surface of a large island floating in the sky. You gently land in a fluffy pile of leaves. It's quite cold, but you don't see much snow. An Elf runs over to greet you.
The Elf explains that you'v... | 227 |
--- Day 1: Chronal Calibration ---
"We've detected some temporal anomalies," one of Santa's Elves at the Temporal Anomaly Research and Detection Instrument Station tells you. She sounded pretty worried when she called you down here. "At 500-year intervals into the past, someone has been changing Santa's history!"
"The... | 228 |
--- Day 13: A Maze of Twisty Little Cubicles ---
You arrive at the first floor of this new building to discover a much less welcoming environment than the shiny atrium of the last one. Instead, you are in a maze of twisty little cubicles, all alike.
Every location in this area is addressed by a pair of non-negative in... | 229 |
--- Day 6: Probably a Fire Hazard ---
Because your neighbors keep defeating you in the holiday house decorating contest year after year, you've decided to deploy one million lights in a 1000x1000 grid.
Furthermore, because you've been especially nice this year, Santa has mailed you instructions on how to display the i... | 230 |
--- Day 2: Bathroom Security ---
You arrive at Easter Bunny Headquarters under cover of darkness. However, you left in such a rush that you forgot to use the bathroom! Fancy office buildings like this one usually have keypad locks on their bathrooms, so you search the front desk for the code.
"In order to improve secu... | 231 |
--- Day 4: Secure Container ---
You arrive at the Venus fuel depot only to discover it's protected by a password. The Elves had written the password on a sticky note, but someone threw it out.
However, they do remember a few key facts about the password:
It is a six-digit number.
The value is within the range given i... | 232 |
--- Day 3: Rucksack Reorganization ---
One Elf has the important job of loading all of the rucksacks with supplies for the jungle journey. Unfortunately, that Elf didn't quite follow the packing instructions, and so a few items now need to be rearranged.
Each rucksack has two large compartments. All items of a given t... | 233 |
--- Day 12: Passage Pathing ---
With your submarine's subterranean subsystems subsisting suboptimally, the only way you're getting out of this cave anytime soon is by finding a path yourself. Not just a path - the only way to know if you've found the best path is to find all of them.
Fortunately, the sensors are still... | 234 |
--- Day 14: Parabolic Reflector Dish ---
You reach the place where all of the mirrors were pointing: a massive parabolic reflector dish attached to the side of another large mountain.
The dish is made up of many small mirrors, but while the mirrors themselves are roughly in the shape of a parabolic reflector dish, eac... | 235 |
--- Day 9: Encoding Error ---
With your neighbor happily enjoying their video game, you turn your attention to an open data port on the little screen in the seat in front of you.
Though the port is non-standard, you manage to connect it to your computer through the clever use of several paperclips. Upon connection, th... | 236 |
--- Day 8: Treetop Tree House ---
The expedition comes across a peculiar patch of tall trees all planted carefully in a grid. The Elves explain that a previous expedition planted these trees as a reforestation effort. Now, they're curious if this would be a good location for a tree house.
First, determine whether ther... | 237 |
--- Day 2: I Was Told There Would Be No Math ---
The elves are running low on wrapping paper, and so they need to submit an order for more. They have a list of the dimensions (length l, width w, and height h) of each present, and only want to order exactly as much as they need.
Fortunately, every present is a box (a p... | 238 |
--- Day 23: Opening the Turing Lock ---
Little Jane Marie just got her very first computer for Christmas from some unknown benefactor. It comes with instructions and an example program, but the computer itself seems to be malfunctioning. She's curious what the program does, and would like you to help her run it.
The m... | 239 |
--- Day 16: Chronal Classification ---
As you see the Elves defend their hot chocolate successfully, you go back to falling through time. This is going to become a problem.
If you're ever going to return to your own time, you need to understand how this device on your wrist works. You have a little while before you re... | 240 |
--- Day 16: Permutation Promenade ---
You come upon a very unusual sight; a group of programs here appear to be dancing.
There are sixteen programs in total, named a through p. They start by standing in a line: a stands in position 0, b stands in position 1, and so on until p, which stands in position 15.
The program... | 241 |
--- Day 23: Amphipod ---
A group of amphipods notice your fancy submarine and flag you down. "With such an impressive shell," one amphipod says, "surely you can help us with a question that has stumped our best scientists."
They go on to explain that a group of timid, stubborn amphipods live in a nearby burrow. Four t... | 242 |
--- Day 21: Chronal Conversion ---
You should have been watching where you were going, because as you wander the new North Pole base, you trip and fall into a very deep hole!
Just kidding. You're falling through time again.
If you keep up your current pace, you should have resolved all of the temporal anomalies by th... | 243 |
--- Day 16: Dragon Checksum ---
You're done scanning this part of the network, but you've left traces of your presence. You need to overwrite some disks with random-looking data to cover your tracks and update the local security system with a new checksum for those disks.
For the data to not be suspicious, it needs to... | 244 |
--- Day 16: Packet Decoder ---
As you leave the cave and reach open waters, you receive a transmission from the Elves back on the ship.
The transmission was sent using the Buoyancy Interchange Transmission System (BITS), a method of packing numeric expressions into a binary sequence. Your submarine's computer has save... | 245 |
--- Day 21: Scrambled Letters and Hash ---
The computer system you're breaking into uses a weird scrambling function to store its passwords. It shouldn't be much trouble to create your own scrambled password so you can add it to the system; you just have to implement the scrambler.
The scrambling function is a series ... | 246 |
--- Day 16: Permutation Promenade ---
You come upon a very unusual sight; a group of programs here appear to be dancing.
There are sixteen programs in total, named a through p. They start by standing in a line: a stands in position 0, b stands in position 1, and so on until p, which stands in position 15.
The program... | 247 |
--- Day 17: Clumsy Crucible ---
The lava starts flowing rapidly once the Lava Production Facility is operational. As you leave, the reindeer offers you a parachute, allowing you to quickly reach Gear Island.
As you descend, your bird's-eye view of Gear Island reveals why you had trouble finding anyone on your way up: ... | 248 |
--- Day 13: Distress Signal ---
You climb the hill and again try contacting the Elves. However, you instead receive a signal you weren't expecting: a distress signal.
Your handheld device must still not be working properly; the packets from the distress signal got decoded out of order. You'll need to re-order the list... | 249 |
--- Day 1: Trebuchet?! ---
Something is wrong with global snow production, and you've been selected to take a look. The Elves have even given you a map; on it, they've used stars to mark the top fifty locations that are likely to be having problems.
You've been doing this long enough to know that to restore snow opera... | 250 |
--- Day 5: Print Queue ---
Satisfied with their search on Ceres, the squadron of scholars suggests subsequently scanning the stationery stacks of sub-basement 17.
The North Pole printing department is busier than ever this close to Christmas, and while The Historians continue their search of this historically signific... | 251 |
--- Day 23: Amphipod ---
A group of amphipods notice your fancy submarine and flag you down. "With such an impressive shell," one amphipod says, "surely you can help us with a question that has stumped our best scientists."
They go on to explain that a group of timid, stubborn amphipods live in a nearby burrow. Four t... | 252 |
--- Day 13: Shuttle Search ---
Your ferry can make it safely to a nearby port, but it won't get much further. When you call to book another ship, you discover that no ships embark from that port to your vacation island. You'll need to get from the port to the nearest airport.
Fortunately, a shuttle bus service is avai... | 253 |
--- Day 7: No Space Left On Device ---
You can hear birds chirping and raindrops hitting leaves as the expedition proceeds. Occasionally, you can even hear much louder sounds in the distance; how big do the animals get out here, anyway?
The device the Elves gave you has problems with more than just its communication s... | 254 |
--- Day 11: Dumbo Octopus ---
You enter a large cavern full of rare bioluminescent dumbo octopuses! They seem to not like the Christmas lights on your submarine, so you turn them off for now.
There are 100 octopuses arranged neatly in a 10 by 10 grid. Each octopus slowly gains energy over time and flashes brightly for... | 255 |
--- Day 23: LAN Party ---
As The Historians wander around a secure area at Easter Bunny HQ, you come across posters for a LAN party scheduled for today! Maybe you can find it; you connect to a nearby datalink port and download a map of the local network (your puzzle input).
The network map provides a list of every con... | 256 |
--- Day 16: Dragon Checksum ---
You're done scanning this part of the network, but you've left traces of your presence. You need to overwrite some disks with random-looking data to cover your tracks and update the local security system with a new checksum for those disks.
For the data to not be suspicious, it needs to... | 257 |
--- Day 3: Gear Ratios ---
You and the Elf eventually reach a gondola lift station; he says the gondola lift will take you up to the water source, but this is as far as he can bring you. You go inside.
It doesn't take long to find the gondolas, but there seems to be a problem: they're not moving.
"Aaah!"
You turn ar... | 258 |
--- Day 4: The Ideal Stocking Stuffer ---
Santa needs help mining some AdventCoins (very similar to bitcoins) to use as gifts for all the economically forward-thinking little girls and boys.
To do this, he needs to find MD5 hashes which, in hexadecimal, start with at least five zeroes. The input to the MD5 hash is som... | 259 |
--- Day 17: Set and Forget ---
An early warning system detects an incoming solar flare and automatically activates the ship's electromagnetic shield. Unfortunately, this has cut off the Wi-Fi for many small robots that, unaware of the impending danger, are now trapped on exterior scaffolding on the unsafe side of the s... | 260 |
--- Day 8: Memory Maneuver ---
The sleigh is much easier to pull than you'd expect for something its weight. Unfortunately, neither you nor the Elves know which way the North Pole is from here.
You check your wrist device for anything that might help. It seems to have some kind of navigation system! Activating the nav... | 261 |
--- Day 13: Mine Cart Madness ---
A crop of this size requires significant logistics to transport produce, soil, fertilizer, and so on. The Elves are very busy pushing things around in carts on some kind of rudimentary system of tracks they've come up with.
Seeing as how cart-and-track systems don't appear in recorded... | 262 |
--- Day 16: The Floor Will Be Lava ---
With the beam of light completely focused somewhere, the reindeer leads you deeper still into the Lava Production Facility. At some point, you realize that the steel facility walls have been replaced with cave, and the doorways are just cave, and the floor is cave, and you're pret... | 263 |
--- Day 11: Space Police ---
On the way to Jupiter, you're pulled over by the Space Police.
"Attention, unmarked spacecraft! You are in violation of Space Law! All spacecraft must have a clearly visible registration identifier! You have 24 hours to comply or be sent to Space Jail!"
Not wanting to be sent to Space Jai... | 264 |
--- Day 19: Aplenty ---
The Elves of Gear Island are thankful for your help and send you on your way. They even have a hang glider that someone stole from Desert Island; since you're already going that direction, it would help them a lot if you would use it to get down there and return it to them.
As you reach the bot... | 265 |
--- Day 4: Passport Processing ---
You arrive at the airport only to realize that you grabbed your North Pole Credentials instead of your passport. While these documents are extremely similar, North Pole Credentials aren't issued by a country and therefore aren't actually valid documentation for travel in most of the w... | 266 |
--- Day 10: Cathode-Ray Tube ---
You avoid the ropes, plunge into the river, and swim to shore.
The Elves yell something about meeting back up with them upriver, but the river is too loud to tell exactly what they're saying. They finish crossing the bridge and disappear from view.
Situations like this must be why the... | 267 |
--- Day 18: Many-Worlds Interpretation ---
As you approach Neptune, a planetary security system detects you and activates a giant tractor beam on Triton! You have no choice but to land.
A scan of the local area reveals only one interesting feature: a massive underground vault. You generate a map of the tunnels (your p... | 268 |
--- Day 17: No Such Thing as Too Much ---
The elves bought too much eggnog again - 150 liters this time. To fit it all into your refrigerator, you'll need to move it into smaller containers. You take an inventory of the capacities of the available containers.
For example, suppose you have containers of size 20, 15, 10... | 269 |
--- Day 2: Corruption Checksum ---
As you walk through the door, a glowing humanoid shape yells in your direction. "You there! Your state appears to be idle. Come help us repair the corruption in this spreadsheet - if we take another millisecond, we'll have to display an hourglass cursor!"
The spreadsheet consists of ... | 270 |
--- Day 5: A Maze of Twisty Trampolines, All Alike ---
An urgent interrupt arrives from the CPU: it's trapped in a maze of jump instructions, and it would like assistance from any programs with spare cycles to help find the exit.
The message includes a list of the offsets for each jump. Jumps are relative: -1 moves to... | 271 |
--- Day 21: Dirac Dice ---
There's not much to do as you slowly descend to the bottom of the ocean. The submarine computer challenges you to a nice game of Dirac Dice.
This game consists of a single die, two pawns, and a game board with a circular track containing ten spaces marked 1 through 10 clockwise. Each player'... | 272 |
--- Day 8: Two-Factor Authentication ---
You come across a door implementing what you can only assume is an implementation of two-factor authentication after a long game of requirements telephone.
To get past the door, you first swipe a keycard (no problem; there was one on a nearby desk). Then, it displays a code on ... | 273 |
--- Day 24: Immune System Simulator 20XX ---
After a weird buzzing noise, you appear back at the man's cottage. He seems relieved to see his friend, but quickly notices that the little reindeer caught some kind of cold while out exploring.
The portly man explains that this reindeer's immune system isn't similar to reg... | 274 |
--- Day 15: Rambunctious Recitation ---
You catch the airport shuttle and try to book a new flight to your vacation island. Due to the storm, all direct flights have been cancelled, but a route is available to get around the storm. You take it.
While you wait for your flight, you decide to check in with the Elves back... | 275 |
--- Day 3: Perfectly Spherical Houses in a Vacuum ---
Santa is delivering presents to an infinite two-dimensional grid of houses.
He begins by delivering a present to the house at his starting location, and then an elf at the North Pole calls him via radio and tells him where to move next. Moves are always exactly one... | 276 |
--- Day 21: Fractal Art ---
You find a program trying to generate some art. It uses a strange process that involves repeatedly enhancing the detail of an image through a set of rules.
The image consists of a two-dimensional square grid of pixels that are either on (#) or off (.). The program always begins with this pa... | 277 |
--- Day 9: Explosives in Cyberspace ---
Wandering around a secure area, you come across a datalink port to a new part of the network. After briefly scanning it for interesting files, you find one file in particular that catches your attention. It's compressed with an experimental format, but fortunately, the documentat... | 278 |
--- Day 15: Beverage Bandits ---
Having perfected their hot chocolate, the Elves have a new problem: the Goblins that live in these caves will do anything to steal it. Looks like they're here for a fight.
You scan the area, generating a map of the walls (#), open cavern (.), and starting position of every Goblin (G) a... | 279 |
--- Day 5: Doesn't He Have Intern-Elves For This? ---
Santa needs help figuring out which strings in his text file are naughty or nice.
A nice string is one with all of the following properties:
It contains at least three vowels (aeiou only), like aei, xazegov, or aeiouaeiouaeiou.
It contains at least one letter that... | 280 |
--- Day 12: Rain Risk ---
Your ferry made decent progress toward the island, but the storm came in faster than anyone expected. The ferry needs to take evasive actions!
Unfortunately, the ship's navigation computer seems to be malfunctioning; rather than giving a route directly to safety, it produced extremely circuit... | 281 |
--- Day 24: Electromagnetic Moat ---
The CPU itself is a large, black building surrounded by a bottomless pit. Enormous metal tubes extend outward from the side of the building at regular intervals and descend down into the void. There's no way to cross, but you need to get inside.
No way, of course, other than buildi... | 282 |
--- Day 12: Subterranean Sustainability ---
The year 518 is significantly more underground than your history books implied. Either that, or you've arrived in a vast cavern network under the North Pole.
After exploring a little, you discover a long tunnel that contains a row of small pots as far as you can see to your ... | 283 |
--- Day 13: Claw Contraption ---
Next up: the lobby of a resort on a tropical island. The Historians take a moment to admire the hexagonal floor tiles before spreading out.
Fortunately, it looks like the resort has a new arcade! Maybe you can win some prizes from the claw machines?
The claw machines here are a little... | 284 |
--- Day 22: Sporifica Virus ---
Diagnostics indicate that the local grid computing cluster has been contaminated with the Sporifica Virus. The grid computing cluster is a seemingly-infinite two-dimensional grid of compute nodes. Each node is either clean or infected by the virus.
To prevent overloading the nodes (whic... | 285 |
--- Day 24: It Hangs in the Balance ---
It's Christmas Eve, and Santa is loading up the sleigh for this year's deliveries. However, there's one small problem: he can't get the sleigh to balance. If it isn't balanced, he can't defy physics, and nobody gets presents this year.
No pressure.
Santa has provided you a list... | 286 |
--- Day 5: Sunny with a Chance of Asteroids ---
You're starting to sweat as the ship makes its way toward Mercury. The Elves suggest that you get the air conditioner working by upgrading your ship computer to support the Thermal Environment Supervision Terminal.
The Thermal Environment Supervision Terminal (TEST) star... | 287 |
--- Day 3: Binary Diagnostic ---
The submarine has been making some odd creaking noises, so you ask it to produce a diagnostic report just in case.
The diagnostic report (your puzzle input) consists of a list of binary numbers which, when decoded properly, can tell you many useful things about the conditions of the su... | 288 |
--- Day 11: Seating System ---
Your plane lands with plenty of time to spare. The final leg of your journey is a ferry that goes directly to the tropical island where you can finally start your vacation. As you reach the waiting area to board the ferry, you realize you're so early, nobody else has even arrived yet!
By... | 289 |
--- Day 4: Repose Record ---
You've sneaked into another supply closet - this time, it's across from the prototype suit manufacturing lab. You need to sneak inside and fix the issues with the suit, but there's a guard stationed outside the lab, so this is as close as you can safely get.
As you search the closet for an... | 290 |
--- Day 8: Seven Segment Search ---
You barely reach the safety of the cave when the whale smashes into the cave mouth, collapsing it. Sensors indicate another exit to this cave at a much greater depth, so you have no choice but to press on.
As your submarine slowly makes its way through the cave system, you notice th... | 291 |
--- Day 4: Passport Processing ---
You arrive at the airport only to realize that you grabbed your North Pole Credentials instead of your passport. While these documents are extremely similar, North Pole Credentials aren't issued by a country and therefore aren't actually valid documentation for travel in most of the w... | 292 |
--- Day 9: Rope Bridge ---
This rope bridge creaks as you walk along it. You aren't sure how old it is, or whether it can even support your weight.
It seems to support the Elves just fine, though. The bridge spans a gorge which was carved out by the massive river far below you.
You step carefully; as you do, the rope... | 293 |
--- Day 19: Medicine for Rudolph ---
Rudolph the Red-Nosed Reindeer is sick! His nose isn't shining very brightly, and he needs medicine.
Red-Nosed Reindeer biology isn't similar to regular reindeer biology; Rudolph is going to need custom-made medicine. Unfortunately, Red-Nosed Reindeer chemistry isn't similar to reg... | 294 |
--- Day 3: Toboggan Trajectory ---
With the toboggan login problems resolved, you set off toward the airport. While travel by toboggan might be easy, it's certainly not safe: there's very minimal steering and the area is covered in trees. You'll need to see which angles will take you near the fewest trees.
Due to the ... | 295 |
--- Day 22: Grid Computing ---
You gain access to a massive storage cluster arranged in a grid; each storage node is only connected to the four nodes directly adjacent to it (three if the node is on an edge, two if it's in a corner).
You can directly access data only on node /dev/grid/node-x0-y0, but you can perform s... | 296 |
--- Day 6: Lanternfish ---
The sea floor is getting steeper. Maybe the sleigh keys got carried this way?
A massive school of glowing lanternfish swims past. They must spawn quickly to reach such large numbers - maybe exponentially quickly? You should model their growth rate to be sure.
Although you know nothing about... | 297 |
--- Day 1: Not Quite Lisp ---
Santa was hoping for a white Christmas, but his weather machine's "snow" function is powered by stars, and he's fresh out! To save Christmas, he needs you to collect fifty stars by December 25th.
Collect stars by helping Santa solve puzzles. Two puzzles will be made available on each day ... | 298 |
--- Day 13: Packet Scanners ---
You need to cross a vast firewall. The firewall consists of several layers, each with a security scanner that moves back and forth across the layer. To succeed, you must not be detected by a scanner.
By studying the firewall briefly, you are able to record (in your puzzle input) the dep... | 299 |
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