From 0ef3abfb3f560e9ab6e97e3e48bb005eb3d97bfd Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Th=C3=A9o=20LUDWIG?= Date: Sat, 2 Dec 2023 23:51:05 +0100 Subject: [PATCH] feat: add day 2 --- day_2/README.md | 64 ++++++++++++- day_2/input.txt | 100 ++++++++++++++++++++ day_2/input_example_1.txt | 5 + day_2/src/lib.rs | 188 ++++++++++++++++++++++++++++++++++++++ day_2/src/main.rs | 20 +--- 5 files changed, 361 insertions(+), 16 deletions(-) create mode 100644 day_2/input.txt create mode 100644 day_2/input_example_1.txt create mode 100644 day_2/src/lib.rs diff --git a/day_2/README.md b/day_2/README.md index 79cb764..7ce5cc2 100644 --- a/day_2/README.md +++ b/day_2/README.md @@ -1,7 +1,69 @@ -# - Day 2 - +# - Day 2: Cube Conundrum - Source: ## Instructions - 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: + +```txt +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?** + +To begin, [get your puzzle input](./input.txt). + +Your puzzle answer was `2617`. + +**The first half of this puzzle is complete! It provides one gold star: `*`.** + ## Instructions - Part 2 + +The Elf says they've stopped producing snow because they aren't getting any **water**! He isn't sure why the water stopped; however, he can show you how to get to the water source to check it out for yourself. It's just up ahead! + +As you continue your walk, the Elf poses a second question: in each game you played, what is the **fewest number of cubes of each color** that could have been in the bag to make the game possible? + +Again consider the example games from earlier: + +```txt +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, the game could have been played with as few as 4 red, 2 green, and 6 blue cubes. If any color had even one fewer cube, the game would have been impossible. +- Game 2 could have been played with a minimum of 1 red, 3 green, and 4 blue cubes. +- Game 3 must have been played with at least 20 red, 13 green, and 6 blue cubes. +- Game 4 required at least 14 red, 3 green, and 15 blue cubes. +- Game 5 needed no fewer than 6 red, 3 green, and 2 blue cubes in the bag. + +The **power** of a set of cubes is equal to the numbers of red, green, and blue cubes multiplied together. The power of the minimum set of cubes in game 1 is `48`. In games 2-5 it was `12`, `1560`, `630`, and `36`, respectively. Adding up these five powers produces the sum **`2286`**. + +For each game, find the minimum set of cubes that must have been present. **What is the sum of the power of these sets?** + +Your puzzle answer was `59795`. + +**Both parts of this puzzle are complete! They provide two gold stars: `**`.** diff --git a/day_2/input.txt b/day_2/input.txt new file mode 100644 index 0000000..8a9d45e --- /dev/null +++ b/day_2/input.txt @@ -0,0 +1,100 @@ +Game 1: 5 red, 1 green, 2 blue; 2 green, 8 blue, 6 red; 8 red, 3 blue, 2 green; 6 red, 1 green, 19 blue; 1 red, 17 blue +Game 2: 4 red, 5 green, 2 blue; 7 red, 14 green, 3 blue; 2 green, 5 blue, 11 red; 10 blue, 3 green; 9 green, 6 blue, 13 red; 7 red, 5 green, 9 blue +Game 3: 9 green, 18 blue, 1 red; 6 red, 10 blue, 5 green; 4 blue, 4 red, 15 green +Game 4: 1 red, 13 green; 10 green, 2 red; 3 red, 4 green, 2 blue +Game 5: 4 red, 2 green, 1 blue; 4 red, 9 blue; 4 green, 1 red, 6 blue; 3 blue, 2 green, 6 red; 5 red, 4 green, 1 blue +Game 6: 6 red, 3 green, 6 blue; 3 green, 5 blue, 12 red; 3 green, 9 blue, 3 red; 13 red, 8 blue +Game 7: 3 blue, 1 red; 3 blue, 10 green; 4 green, 5 blue +Game 8: 11 green, 4 blue; 4 red, 4 blue, 11 green; 4 green, 3 blue; 1 blue, 6 red, 12 green +Game 9: 1 blue, 4 green, 1 red; 5 green, 3 blue; 9 green, 4 blue; 3 blue, 1 red, 10 green; 6 green, 2 blue +Game 10: 5 green, 6 red, 7 blue; 7 green, 5 blue, 5 red; 8 red, 6 blue, 8 green; 2 blue, 8 green, 6 red; 6 blue, 8 red, 4 green +Game 11: 1 blue, 10 red, 10 green; 11 green, 2 blue, 16 red; 4 blue, 7 red, 14 green +Game 12: 8 green, 9 red, 12 blue; 2 green, 4 blue, 7 red; 1 red, 9 blue, 7 green; 8 green, 2 red, 10 blue; 1 green, 5 red, 5 blue; 6 green, 5 red, 1 blue +Game 13: 3 green, 1 blue, 6 red; 1 green, 10 red; 1 blue, 15 red, 2 green +Game 14: 2 green, 6 blue; 1 green, 2 blue, 2 red; 5 blue, 1 green, 2 red; 4 green, 5 blue, 4 red; 4 red, 5 green, 4 blue; 1 red, 5 green, 6 blue +Game 15: 12 green, 7 blue; 19 green; 11 blue, 16 green, 1 red; 1 red, 2 green, 3 blue; 8 blue, 1 red, 19 green; 14 blue, 3 green, 1 red +Game 16: 2 green, 13 blue, 3 red; 5 red, 12 blue; 6 blue, 8 red; 4 red, 1 green, 4 blue; 1 green, 15 blue; 4 blue, 2 green, 1 red +Game 17: 11 blue, 7 green, 2 red; 12 red, 8 green, 8 blue; 2 red, 6 blue, 6 green +Game 18: 1 green, 2 blue; 2 green, 1 blue, 4 red; 3 green, 16 red; 2 red, 3 green +Game 19: 11 blue, 3 green, 3 red; 11 blue, 5 green; 3 green, 3 red, 8 blue +Game 20: 1 green, 6 blue; 4 blue, 6 green; 1 red, 10 green; 12 green; 5 blue, 1 red, 4 green; 1 green, 5 blue +Game 21: 7 green, 3 blue; 1 red, 5 blue, 6 green; 1 red, 11 green; 8 blue, 1 red, 10 green; 1 red, 5 blue, 3 green +Game 22: 3 red, 1 blue; 3 green, 1 red, 1 blue; 7 green, 2 blue +Game 23: 12 green, 1 red, 2 blue; 10 blue, 1 green, 1 red; 9 blue, 8 green +Game 24: 5 blue, 6 green, 6 red; 3 blue, 1 red; 8 blue, 2 green, 12 red; 1 green, 2 blue, 14 red; 2 blue, 5 green, 15 red +Game 25: 6 red, 13 green; 1 blue, 1 red, 3 green; 1 blue, 12 red, 10 green +Game 26: 16 red, 2 blue, 7 green; 1 blue, 7 green, 8 red; 1 blue, 3 red, 9 green +Game 27: 4 blue, 15 green; 6 green, 2 blue, 1 red; 9 blue, 10 green, 4 red; 3 red, 3 green, 6 blue; 11 blue, 7 red, 11 green; 6 red, 5 green, 13 blue +Game 28: 10 blue, 8 red, 10 green; 4 blue, 11 red, 6 green; 8 red, 9 green, 10 blue; 4 red, 9 green, 2 blue +Game 29: 4 red, 9 green, 7 blue; 10 blue, 6 green, 4 red; 1 green, 2 red, 10 blue; 3 green, 9 blue +Game 30: 6 blue, 9 green, 10 red; 6 blue, 4 red; 5 green, 2 blue; 5 green, 2 red, 2 blue; 6 blue, 8 green +Game 31: 7 blue; 2 green, 6 blue; 1 red, 9 blue, 5 green +Game 32: 8 blue, 2 red, 4 green; 6 red, 2 blue, 1 green; 14 blue, 8 green, 8 red +Game 33: 1 green, 1 red, 1 blue; 2 blue, 1 green, 12 red; 1 green, 1 red; 1 blue, 2 red, 1 green; 7 red, 2 green, 2 blue +Game 34: 3 blue; 2 blue; 10 red, 1 blue, 1 green; 5 red; 1 green, 1 red, 1 blue; 1 green, 2 red +Game 35: 10 green, 1 red, 16 blue; 4 red, 10 blue, 9 green; 1 green, 7 blue, 5 red +Game 36: 1 blue, 3 red, 16 green; 1 blue, 3 red, 1 green; 9 green, 3 red, 8 blue; 14 green, 6 blue, 3 red; 3 red, 12 green, 4 blue +Game 37: 11 red, 3 blue; 15 red, 8 blue, 6 green; 6 green, 19 red, 11 blue; 1 green, 4 blue, 14 red; 12 blue, 5 red, 8 green; 4 blue, 9 red +Game 38: 4 green, 10 blue, 3 red; 1 green, 1 red, 11 blue; 2 red, 12 blue +Game 39: 3 green, 1 red, 4 blue; 9 green, 1 red, 18 blue; 4 red, 4 green, 17 blue; 4 red, 10 blue, 14 green +Game 40: 5 red, 4 green, 8 blue; 1 green, 9 blue; 9 blue, 3 red, 6 green; 8 red, 9 blue, 9 green +Game 41: 1 blue, 9 red, 3 green; 9 red, 10 green, 15 blue; 13 red, 8 green, 8 blue; 19 red, 6 blue, 2 green; 7 green, 5 blue, 12 red +Game 42: 15 blue; 1 red, 1 green, 9 blue; 6 blue, 1 red; 1 green, 4 blue +Game 43: 1 green, 8 blue, 2 red; 1 red, 1 green, 6 blue; 7 blue; 7 blue, 3 red, 1 green; 2 red, 5 blue +Game 44: 7 green, 11 blue, 6 red; 9 green, 8 blue; 4 red, 15 green; 12 green, 14 blue, 8 red +Game 45: 4 red, 4 green; 14 green; 4 green, 2 blue; 1 blue, 12 red, 5 green; 3 red, 6 green; 11 red, 1 green +Game 46: 2 blue, 1 green, 1 red; 1 blue, 6 green, 1 red; 2 blue, 1 red, 1 green; 5 green +Game 47: 1 blue, 1 red; 14 red; 3 green, 2 blue, 17 red; 4 green +Game 48: 1 red, 11 green, 2 blue; 1 red, 11 green, 6 blue; 13 green, 1 blue, 3 red; 3 green, 4 red, 6 blue; 12 green, 5 blue, 1 red; 2 red, 4 green, 4 blue +Game 49: 5 blue, 3 green; 2 green, 8 blue; 5 blue; 4 green, 5 blue, 1 red; 4 green, 7 blue; 1 green, 3 blue +Game 50: 3 red, 5 green, 2 blue; 9 green, 7 red, 4 blue; 3 blue, 6 red, 13 green; 6 blue, 8 red, 9 green +Game 51: 2 green, 11 red, 7 blue; 5 blue, 13 red; 1 green, 2 blue, 3 red; 6 blue, 8 red; 11 red, 2 green, 4 blue +Game 52: 15 blue, 1 green, 4 red; 4 green, 10 blue, 2 red; 6 red, 18 blue, 1 green +Game 53: 2 red, 10 green, 6 blue; 4 green, 3 blue, 3 red; 17 blue, 19 green, 5 red; 6 blue, 6 green, 9 red; 5 blue, 17 green, 7 red +Game 54: 9 blue, 8 red, 6 green; 6 red, 8 green; 1 green, 6 blue, 1 red; 5 red, 4 green, 9 blue; 5 blue, 2 green, 5 red +Game 55: 8 blue, 8 red, 10 green; 3 red, 4 green, 9 blue; 4 red, 3 green, 7 blue +Game 56: 3 red, 6 green, 1 blue; 5 green, 1 blue, 1 red; 1 red, 2 green; 10 green +Game 57: 1 green, 4 blue, 12 red; 17 red, 7 blue, 10 green; 17 red, 5 blue, 3 green +Game 58: 1 red, 5 green, 14 blue; 5 green, 6 red, 7 blue; 4 blue, 8 green; 3 red, 9 green, 7 blue; 8 blue, 8 green, 6 red; 8 green, 7 blue, 5 red +Game 59: 3 green, 5 red; 2 red, 13 green, 1 blue; 19 green, 1 red, 1 blue; 19 green, 1 blue; 18 green, 1 blue, 5 red; 6 red, 9 green +Game 60: 5 red, 1 green, 6 blue; 8 red, 6 blue, 14 green; 8 green, 8 red, 3 blue; 2 blue, 5 green, 3 red; 4 blue, 1 red, 14 green +Game 61: 7 red, 4 blue, 2 green; 2 green, 8 red, 9 blue; 5 blue, 2 green, 8 red; 8 red, 1 green, 8 blue +Game 62: 6 red, 3 blue; 1 blue, 2 red, 2 green; 3 red, 1 blue +Game 63: 2 red, 1 blue, 2 green; 1 blue, 1 green; 2 green, 4 red; 3 green, 2 red; 2 green +Game 64: 5 green, 6 blue, 7 red; 2 red, 5 green, 8 blue; 7 green, 9 blue, 1 red; 4 green, 5 blue; 19 blue, 5 green, 13 red +Game 65: 3 red, 1 blue, 4 green; 5 green, 3 blue; 9 green, 1 red, 10 blue +Game 66: 6 red, 13 green, 2 blue; 2 blue, 5 red, 9 green; 18 red; 2 green, 1 blue, 1 red; 19 red, 10 green; 1 blue, 15 green, 13 red +Game 67: 8 blue, 3 red; 1 red, 12 green, 7 blue; 4 red, 6 blue, 5 green; 11 green, 10 blue, 7 red; 5 red, 9 green, 14 blue +Game 68: 1 red, 3 green; 10 blue, 1 red, 3 green; 1 green, 17 blue; 16 blue; 6 blue +Game 69: 11 green, 5 blue, 8 red; 2 red, 5 green, 1 blue; 10 green, 2 blue; 11 green, 7 red, 4 blue +Game 70: 2 green, 1 blue, 13 red; 16 green, 20 red, 4 blue; 10 red +Game 71: 10 blue, 6 green, 7 red; 5 red, 5 green, 2 blue; 7 green, 4 red, 5 blue; 1 red, 8 blue; 5 red, 1 blue, 8 green; 5 blue, 1 red, 5 green +Game 72: 2 red, 4 green; 2 green, 2 red, 1 blue; 3 blue, 3 green, 2 red; 2 green +Game 73: 5 red, 19 blue; 12 blue, 4 green, 16 red; 14 red, 11 blue, 1 green +Game 74: 2 red, 1 green, 9 blue; 5 blue, 1 green, 2 red; 2 green, 1 red, 13 blue; 2 green, 1 red, 3 blue +Game 75: 7 blue, 1 red, 18 green; 17 green, 8 red, 13 blue; 15 blue, 4 red +Game 76: 1 green, 12 red, 13 blue; 5 green, 11 blue, 12 red; 10 red, 1 green; 10 red, 2 blue; 5 red, 2 green; 2 green, 17 blue, 3 red +Game 77: 2 blue, 1 red, 1 green; 7 red; 7 red, 3 blue, 2 green; 10 green, 1 red; 3 red, 7 blue, 6 green +Game 78: 10 red, 2 blue, 2 green; 1 blue, 6 red, 4 green; 12 red, 8 green; 6 green, 8 red, 7 blue; 11 green, 5 blue, 6 red +Game 79: 7 green, 5 red; 6 blue, 2 green, 15 red; 9 blue, 2 red, 12 green; 1 blue, 4 red, 10 green; 4 blue, 12 green, 11 red; 5 green, 3 red, 5 blue +Game 80: 1 green, 13 blue, 2 red; 2 red, 1 green, 13 blue; 7 blue, 8 red +Game 81: 1 green, 2 red, 11 blue; 5 red, 3 blue; 1 green, 1 red; 14 red, 1 green +Game 82: 12 red, 3 blue, 8 green; 15 red, 9 blue, 8 green; 6 blue, 13 red, 8 green +Game 83: 4 blue, 6 green, 3 red; 7 red, 2 blue, 9 green; 6 green, 3 red +Game 84: 4 green; 3 red, 3 blue; 4 red, 1 blue, 2 green; 1 red, 5 green, 5 blue; 1 red, 5 blue, 3 green +Game 85: 3 red, 4 blue, 15 green; 9 green; 2 red, 4 blue, 6 green; 1 red, 4 green, 7 blue; 3 red, 10 green, 9 blue; 1 red, 13 green, 3 blue +Game 86: 8 red, 6 blue; 3 blue, 3 green, 15 red; 12 red, 6 green, 13 blue; 15 red, 6 green, 10 blue +Game 87: 4 red, 4 blue; 6 red, 2 blue; 5 blue, 3 green; 4 blue, 2 red +Game 88: 4 blue, 7 green; 2 blue, 7 green; 6 green, 4 blue; 1 red, 1 blue, 2 green; 11 green, 3 blue +Game 89: 1 blue, 12 green, 11 red; 3 red, 7 blue, 1 green; 7 green, 8 red; 6 blue, 2 green, 3 red; 7 red, 8 green; 11 blue, 5 red, 12 green +Game 90: 1 green, 12 red, 17 blue; 14 red, 17 blue, 9 green; 6 green, 9 red, 11 blue +Game 91: 3 green, 14 blue; 2 blue, 2 green, 6 red; 1 red, 11 blue, 1 green; 3 green, 4 red, 20 blue; 6 red, 2 green, 3 blue; 10 blue, 12 red +Game 92: 6 blue, 7 red; 2 blue, 4 red, 1 green; 4 red, 1 green, 3 blue; 2 red, 5 blue; 8 red, 6 blue; 1 green, 2 blue, 1 red +Game 93: 4 blue, 1 green, 4 red; 8 red, 4 green, 4 blue; 2 blue, 9 red; 1 blue, 4 red; 4 blue, 2 green, 11 red +Game 94: 5 blue, 1 green, 7 red; 1 green, 11 blue, 1 red; 1 green, 15 blue, 4 red +Game 95: 1 red, 3 blue; 1 red, 1 green, 8 blue; 3 red, 1 green, 3 blue; 3 red, 6 blue; 6 blue +Game 96: 4 green, 1 blue; 7 green, 3 red; 2 blue, 9 red, 16 green; 3 blue, 4 red, 11 green +Game 97: 6 green, 8 blue; 1 blue, 1 green; 3 green, 4 blue; 8 blue, 5 green, 2 red +Game 98: 18 blue, 6 green; 11 green, 3 blue, 7 red; 18 blue, 3 red, 7 green; 5 red, 5 green; 8 blue, 2 green, 11 red +Game 99: 3 red, 2 green, 3 blue; 1 red, 4 green, 1 blue; 2 green, 18 red; 15 red, 1 blue; 2 blue, 9 red, 2 green; 17 red, 3 blue, 4 green +Game 100: 9 blue, 8 red, 16 green; 3 red, 7 green, 8 blue; 1 green, 3 red, 12 blue; 3 green, 14 blue diff --git a/day_2/input_example_1.txt b/day_2/input_example_1.txt new file mode 100644 index 0000000..295c36d --- /dev/null +++ b/day_2/input_example_1.txt @@ -0,0 +1,5 @@ +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 diff --git a/day_2/src/lib.rs b/day_2/src/lib.rs new file mode 100644 index 0000000..44ab69d --- /dev/null +++ b/day_2/src/lib.rs @@ -0,0 +1,188 @@ +use std::str::FromStr; + +const NUMBER_OF_RED_CUBES_IN_THE_BAG: usize = 12; +const NUMBER_OF_GREEN_CUBES_IN_THE_BAG: usize = 13; +const NUMBER_OF_BLUE_CUBES_IN_THE_BAG: usize = 14; + +#[derive(Debug, Default, PartialEq)] +pub struct NumberOfCubesOfEachColor { + pub red: usize, + pub green: usize, + pub blue: usize, +} + +impl FromStr for NumberOfCubesOfEachColor { + type Err = &'static str; + + /// Parses a string `string` to return a value of [`NumberOfCubesOfEachColor`] + /// + /// If parsing succeeds, return the value inside [`Ok`], otherwise + /// when the string is ill-formatted return an error specific to the + /// inside [`Err`]. + /// + /// # Examples + /// + /// ``` + /// use std::str::FromStr; + /// use day_2::NumberOfCubesOfEachColor; + /// + /// let string = "3 blue, 4 red"; + /// let expected_result = NumberOfCubesOfEachColor { + /// red: 4, + /// green: 0, + /// blue: 3, + /// }; + /// let actual_result = NumberOfCubesOfEachColor::from_str(string).unwrap(); + /// + /// assert_eq!(actual_result, expected_result); + /// ``` + fn from_str(string: &str) -> Result { + let mut result = NumberOfCubesOfEachColor::default(); + let subsets = string.split(", "); + for subset in subsets { + let mut subset_splitted = subset.split_ascii_whitespace(); + let number: usize = subset_splitted.next().unwrap_or("0").parse().unwrap_or(0); + let color = subset_splitted.next(); + if let Some(color) = color { + match color { + "red" => result.red = number, + "blue" => result.blue = number, + "green" => result.green = number, + _ => {} + } + } + } + Ok(result) + } +} + +#[derive(Debug, Default, PartialEq)] +pub struct Game { + pub id: usize, + pub subsets_of_cubes: Vec, +} + +impl FromStr for Game { + type Err = &'static str; + + /// Parses a string `string` to return a value of [`Game`] + /// + /// If parsing succeeds, return the value inside [`Ok`], otherwise + /// when the string is ill-formatted return an error specific to the + /// inside [`Err`]. + /// + /// # Examples + /// + /// ``` + /// use std::str::FromStr; + /// use day_2::{Game, NumberOfCubesOfEachColor}; + /// + /// let string = "Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green"; + /// let expected_result = Game { + /// id: 1, + /// subsets_of_cubes: vec![ + /// NumberOfCubesOfEachColor { + /// red: 4, + /// green: 0, + /// blue: 3, + /// }, + /// NumberOfCubesOfEachColor { + /// red: 1, + /// green: 2, + /// blue: 6, + /// }, + /// NumberOfCubesOfEachColor { + /// red: 0, + /// green: 2, + /// blue: 0, + /// }, + /// ], + /// }; + /// let actual_result = Game::from_str(string).unwrap(); + /// + /// assert_eq!(actual_result, expected_result); + /// ``` + fn from_str(string: &str) -> Result { + let mut result = Game::default(); + let mut parts = string.split(": "); + result.id = parts + .next() + .unwrap_or("Game 1") + .strip_prefix("Game ") + .unwrap_or("1") + .parse() + .unwrap_or(1); + result.subsets_of_cubes = parts + .next() + .unwrap_or("0 red, 0 green, 0 blue") + .split("; ") + .map(|string| { + NumberOfCubesOfEachColor::from_str(string) + .unwrap_or(NumberOfCubesOfEachColor::default()) + }) + .collect::>(); + Ok(result) + } +} + +pub fn part_1(input: &str) -> usize { + input + .lines() + .map(|line| Game::from_str(line).unwrap_or_default()) + .filter(|game| { + game.subsets_of_cubes + .iter() + .all(|number_of_cubes_of_each_color| { + number_of_cubes_of_each_color.red <= NUMBER_OF_RED_CUBES_IN_THE_BAG + && number_of_cubes_of_each_color.blue <= NUMBER_OF_BLUE_CUBES_IN_THE_BAG + && number_of_cubes_of_each_color.green <= NUMBER_OF_GREEN_CUBES_IN_THE_BAG + }) + }) + .map(|game| game.id) + .sum::() +} + +pub fn part_2(input: &str) -> usize { + input + .lines() + .map(|line| { + let game = Game::from_str(line).unwrap_or_default(); + let mut maximum_number_of_cubes_of_each_color = NumberOfCubesOfEachColor { + red: 1, + green: 1, + blue: 1, + }; + for number_of_cubes_of_each_color in game.subsets_of_cubes { + if number_of_cubes_of_each_color.red > maximum_number_of_cubes_of_each_color.red { + maximum_number_of_cubes_of_each_color.red = number_of_cubes_of_each_color.red; + } + if number_of_cubes_of_each_color.green > maximum_number_of_cubes_of_each_color.green + { + maximum_number_of_cubes_of_each_color.green = + number_of_cubes_of_each_color.green; + } + if number_of_cubes_of_each_color.blue > maximum_number_of_cubes_of_each_color.blue { + maximum_number_of_cubes_of_each_color.blue = number_of_cubes_of_each_color.blue; + } + } + maximum_number_of_cubes_of_each_color.red + * maximum_number_of_cubes_of_each_color.green + * maximum_number_of_cubes_of_each_color.blue + }) + .sum::() +} + +#[cfg(test)] +mod day_2_tests { + use super::*; + + #[test] + fn test_part_1_example() { + assert_eq!(part_1(include_str!("../input_example_1.txt")), 8); + } + + #[test] + fn test_part_2_example() { + assert_eq!(part_2(include_str!("../input_example_1.txt")), 2286); + } +} diff --git a/day_2/src/main.rs b/day_2/src/main.rs index 3eefe75..16a0c60 100644 --- a/day_2/src/main.rs +++ b/day_2/src/main.rs @@ -1,18 +1,8 @@ -fn part_1() -> i32 { - 142 -} +use day_2::{part_1, part_2}; fn main() { - println!("- Day 2: Title -"); - println!("Answer Part 1: {}", part_1()); -} - -#[cfg(test)] -mod day_2_tests { - use super::*; - - #[test] - fn test_part_1_example() { - assert_eq!(142, part_1()); - } + let input = include_str!("../input.txt"); + println!("- Day 2: Cube Conundrum -"); + println!("Answer Part 1: {}", part_1(input)); + println!("Answer Part 2: {}", part_2(input)); }