diff --git a/2023/day2/Cargo.toml b/2023/day2/Cargo.toml new file mode 100644 index 0000000..8aa34bb --- /dev/null +++ b/2023/day2/Cargo.toml @@ -0,0 +1,8 @@ +[package] +name = "day2" +version = "0.1.0" +edition = "2021" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] diff --git a/2023/day2/README.md b/2023/day2/README.md new file mode 100644 index 0000000..ed1ba34 --- /dev/null +++ b/2023/day2/README.md @@ -0,0 +1,44 @@ +# Day 2: Cube Conundrum + +## Part 1 + +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've arrived at Snow Island and apologizes for the lack of snow. He'll be happy to explain the +situation, but it's a bit of a walk, so you have some time. They don't get many visitors up here; would you like to +play a game in the meantime? + +As you walk, the Elf shows you a small bag and some cubes which are either red, green, or blue. Each time you play +this game, he will hide a secret number of cubes of each color in the bag, and your goal is to figure out information +about the number of cubes. + +To get information, once a bag has been loaded with cubes, the Elf will reach into the bag, grab a handful of random +cubes, show them to you, and then put them back in the bag. He'll do this a few times per game. + +You play several games and record the information from each game (your puzzle input). Each game is listed with its ID +number (like the 11 in Game 11: ...) followed by a semicolon-separated list of subsets of cubes that were revealed +from the bag (like 3 red, 5 green, 4 blue). + +For example, the record of a few games might look like this: + +Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green +Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue +Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red +Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red +Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green + +In game 1, three sets of cubes are revealed from the bag (and then put back again). The first set is 3 blue cubes and +4 red cubes; the second set is 1 red cube, 2 green cubes, and 6 blue cubes; the third set is only 2 green cubes. + +The Elf would first like to know which games would have been possible if the bag contained only 12 red cubes, +13 green cubes, and 14 blue cubes? + +In the example above, games 1, 2, and 5 would have been possible if the bag had been loaded with that configuration. +However, game 3 would have been impossible because at one point the Elf showed you 20 red cubes at once; +similarly, game 4 would also have been impossible because the Elf showed you 15 blue cubes at once. If you add up the +IDs of the games that would have been possible, you get 8. + +Determine which games would have been possible if the bag had been loaded with only 12 red cubes, 13 green cubes, and +14 blue cubes. What is the sum of the IDs of those games? diff --git a/2023/day2/src/main.rs b/2023/day2/src/main.rs new file mode 100644 index 0000000..e7a11a9 --- /dev/null +++ b/2023/day2/src/main.rs @@ -0,0 +1,3 @@ +fn main() { + println!("Hello, world!"); +}