110 lines
5.5 KiB
Plaintext
110 lines
5.5 KiB
Plaintext
Advent of Code
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br0xen (AoC++) 4*
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--- Day 2: Cube Conundrum ---
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You're launched high into the atmosphere! The apex of your trajectory just barely reaches the surface of a large island
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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
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over to greet you.
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The Elf explains that you've arrived at Snow Island and apologizes for the lack of snow. He'll be happy to explain the
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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
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game in the meantime?
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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
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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
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number of cubes.
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To get information, once a bag has been loaded with cubes, the Elf will reach into the bag, grab a handful of random cubes,
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show them to you, and then put them back in the bag. He'll do this a few times per game.
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You play several games and record the information from each game (your puzzle input). Each game is listed with its ID number
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(like the 11 in Game 11: ...) followed by a semicolon-separated list of subsets of cubes that were revealed from the bag
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(like 3 red, 5 green, 4 blue).
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For example, the record of a few games might look like this:
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Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
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Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
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Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
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Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
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Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
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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
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cubes; the second set is 1 red cube, 2 green cubes, and 6 blue cubes; the third set is only 2 green cubes.
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The Elf would first like to know which games would have been possible if the bag contained only 12 red cubes, 13 green
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cubes, and 14 blue cubes?
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In the example above, games 1, 2, and 5 would have been possible if the bag had been loaded with that configuration.
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However, game 3 would have been impossible because at one point the Elf showed you 20 red cubes at once; similarly, game 4
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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
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would have been possible, you get 8.
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Determine which games would have been possible if the bag had been loaded with only 12 red cubes, 13 green cubes, and 14
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blue cubes. What is the sum of the IDs of those games?
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Your puzzle answer was 2727.
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--- Part Two ---
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The Elf says they've stopped producing snow because they aren't getting any water! He isn't sure why the water stopped;
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however, he can show you how to get to the water source to check it out for yourself. It's just up ahead!
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As you continue your walk, the Elf poses a second question: in each game you played, what is the fewest number of cubes of
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each color that could have been in the bag to make the game possible?
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Again consider the example games from earlier:
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Game 1: 3 blue, 4 red; 1 red, 2 green, 6 blue; 2 green
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Game 2: 1 blue, 2 green; 3 green, 4 blue, 1 red; 1 green, 1 blue
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Game 3: 8 green, 6 blue, 20 red; 5 blue, 4 red, 13 green; 5 green, 1 red
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Game 4: 1 green, 3 red, 6 blue; 3 green, 6 red; 3 green, 15 blue, 14 red
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Game 5: 6 red, 1 blue, 3 green; 2 blue, 1 red, 2 green
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• 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
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fewer cube, the game would have been impossible.
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• Game 2 could have been played with a minimum of 1 red, 3 green, and 4 blue cubes.
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•
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• Game 3 must have been played with at least 20 red, 13 green, and 6 blue cubes.
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• Game 4 required at least 14 red, 3 green, and 15 blue cubes.
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• Game 5 needed no fewer than 6 red, 3 green, and 2 blue cubes in the bag.
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The power of a set of cubes is equal to the numbers of red, green, and blue cubes multiplied together. The power of the
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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
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produces the sum 2286.
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For each game, find the minimum set of cubes that must have been present. What is the sum of the power of these sets?
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Your puzzle answer was 56580.
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Both parts of this puzzle are complete! They provide two gold stars: **
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At this point, you should return to your Advent calendar and try another puzzle.
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If you still want to see it, you can get your puzzle input.
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You can also [Shareon Twitter Mastodon] this puzzle.
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References
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Visible links
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. https://adventofcode.com/
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. https://adventofcode.com/2023/about
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. https://adventofcode.com/2023/events
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. https://teespring.com/stores/advent-of-code
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. https://adventofcode.com/2023/settings
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. https://adventofcode.com/2023/auth/logout
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. Advent of Code Supporter
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https://adventofcode.com/2023/support
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. https://adventofcode.com/2023
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. https://adventofcode.com/2023
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. https://adventofcode.com/2023/support
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. https://adventofcode.com/2023/sponsors
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. https://adventofcode.com/2023/leaderboard
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. https://adventofcode.com/2023/stats
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. https://adventofcode.com/2023/sponsors
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. https://adventofcode.com/2023
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. https://adventofcode.com/2023/day/2/input
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