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Link: <https://adventofcode.com/2024/day/16> <br> | ||
Author: Eric Wastl ([@ericwastl](https://twitter.com/ericwastl)) (2024) | ||
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--- | ||
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## --- Day 16: Reindeer Maze --- | ||
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It's time again for the [Reindeer Olympics](/2015/day/14)! This year, the big event is the **Reindeer Maze**, where the Reindeer compete for the **lowest score**. | ||
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You and The Historians arrive to search for the Chief right as the event is about to start. It wouldn't hurt to watch a little, right? | ||
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The Reindeer start on the Start Tile (marked `S`) facing **East** and need to reach the End Tile (marked `E`). They can move forward one tile at a time (increasing their score by `1` point), but never into a wall (`#`). They can also rotate clockwise or counterclockwise 90 degrees at a time (increasing their score by `1000` points). | ||
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To figure out the best place to sit, you start by grabbing a map (your puzzle input) from a nearby kiosk. For example: | ||
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``` | ||
############### | ||
#.......#....E# | ||
#.#.###.#.###.# | ||
#.....#.#...#.# | ||
#.###.#####.#.# | ||
#.#.#.......#.# | ||
#.#.#####.###.# | ||
#...........#.# | ||
###.#.#####.#.# | ||
#...#.....#.#.# | ||
#.#.#.###.#.#.# | ||
#.....#...#.#.# | ||
#.###.#.#.#.#.# | ||
#S..#.....#...# | ||
############### | ||
``` | ||
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There are many paths through this maze, but taking any of the best paths would incur a score of only **`7036`**. This can be achieved by taking a total of `36` steps forward and turning 90 degrees a total of `7` times: | ||
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``` | ||
############### | ||
#.......#....E# | ||
#.#.###.#.###^# | ||
#.....#.#...#^# | ||
#.###.#####.#^# | ||
#.#.#.......#^# | ||
#.#.#####.###^# | ||
#..>>>>>>>>v#^# | ||
###^#.#####v#^# | ||
#>>^#.....#v#^# | ||
#^#.#.###.#v#^# | ||
#^....#...#v#^# | ||
#^###.#.#.#v#^# | ||
#S..#.....#>>^# | ||
############### | ||
``` | ||
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Here's a second example: | ||
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``` | ||
################# | ||
#...#...#...#..E# | ||
#.#.#.#.#.#.#.#.# | ||
#.#.#.#...#...#.# | ||
#.#.#.#.###.#.#.# | ||
#...#.#.#.....#.# | ||
#.#.#.#.#.#####.# | ||
#.#...#.#.#.....# | ||
#.#.#####.#.###.# | ||
#.#.#.......#...# | ||
#.#.###.#####.### | ||
#.#.#...#.....#.# | ||
#.#.#.#####.###.# | ||
#.#.#.........#.# | ||
#.#.#.#########.# | ||
#S#.............# | ||
################# | ||
``` | ||
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In this maze, the best paths cost **`11048`** points; following one such path would look like this: | ||
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``` | ||
################# | ||
#...#...#...#..E# | ||
#.#.#.#.#.#.#.#^# | ||
#.#.#.#...#...#^# | ||
#.#.#.#.###.#.#^# | ||
#>>v#.#.#.....#^# | ||
#^#v#.#.#.#####^# | ||
#^#v..#.#.#>>>>^# | ||
#^#v#####.#^###.# | ||
#^#v#..>>>>^#...# | ||
#^#v###^#####.### | ||
#^#v#>>^#.....#.# | ||
#^#v#^#####.###.# | ||
#^#v#^........#.# | ||
#^#v#^#########.# | ||
#S#>>^..........# | ||
################# | ||
``` | ||
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Note that the path shown above includes one 90 degree turn as the very first move, rotating the Reindeer from facing East to facing North. | ||
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Analyze your map carefully. **What is the lowest score a Reindeer could possibly get?** |
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