157 lines
5.4 KiB
Plaintext
157 lines
5.4 KiB
Plaintext
Advent of Code
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• [About]
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• [Events]
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• [Shop]
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• [Settings]
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• [Log Out]
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br0xen (AoC++) 36*
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var y=2022;
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• [Calendar]
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• [AoC++]
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• [Sponsors]
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• [Leaderboard]
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• [Stats]
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Our sponsors help make Advent of Code possible:
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Infi - De kerstman wil weer cadeaus bezorgen maar komt tot de ontdekking dat zijn
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Kerstman Positioning System (KPS) niet meer werkt. Kan jij hem helpen?
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--- Day 22: Monkey Map ---
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The monkeys take you on a surprisingly easy trail through the jungle. They're even
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going in roughly the right direction according to your handheld device's Grove
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Positioning System.
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As you walk, the monkeys explain that the grove is protected by a force field. To pass
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through the force field, you have to enter a password; doing so involves tracing a
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specific path on a strangely-shaped board.
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At least, you're pretty sure that's what you have to do; the elephants aren't exactly
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fluent in monkey.
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The monkeys give you notes that they took when they last saw the password entered
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(your puzzle input).
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For example:
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...#
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.#..
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#...
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....
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...#.......#
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........#...
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..#....#....
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..........#.
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...#....
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.....#..
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.#......
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......#.
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10R5L5R10L4R5L5
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The first half of the monkeys' notes is a map of the board. It is comprised of a set
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of open tiles (on which you can move, drawn .) and solid walls (tiles which you cannot
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enter, drawn #).
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The second half is a description of the path you must follow. It consists of
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alternating numbers and letters:
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• A number indicates the number of tiles to move in the direction you are facing. If
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you run into a wall, you stop moving forward and continue with the next
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instruction.
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• A letter indicates whether to turn 90 degrees clockwise (R) or counterclockwise
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(L). Turning happens in-place; it does not change your current tile.
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So, a path like 10R5 means "go forward 10 tiles, then turn clockwise 90 degrees, then
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go forward 5 tiles".
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You begin the path in the leftmost open tile of the top row of tiles. Initially, you
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are facing to the right (from the perspective of how the map is drawn).
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If a movement instruction would take you off of the map, you wrap around to the other
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side of the board. In other words, if your next tile is off of the board, you should
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instead look in the direction opposite of your current facing as far as you can until
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you find the opposite edge of the board, then reappear there.
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For example, if you are at A and facing to the right, the tile in front of you is
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marked B; if you are at C and facing down, the tile in front of you is marked D:
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...#
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.#..
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#...
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....
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...#.D.....#
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........#...
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B.#....#...A
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.....C....#.
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...#....
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.....#..
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.#......
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......#.
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It is possible for the next tile (after wrapping around) to be a wall; this still
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counts as there being a wall in front of you, and so movement stops before you
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actually wrap to the other side of the board.
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By drawing the last facing you had with an arrow on each tile you visit, the full path
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taken by the above example looks like this:
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>>v#
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.#v.
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#.v.
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..v.
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...#...v..v#
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>>>v...>#.>>
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..#v...#....
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...>>>>v..#.
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...#....
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.....#..
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.#......
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......#.
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To finish providing the password to this strange input device, you need to determine
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numbers for your final row, column, and facing as your final position appears from the
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perspective of the original map. Rows start from 1 at the top and count downward;
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columns start from 1 at the left and count rightward. (In the above example, row 1,
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column 1 refers to the empty space with no tile on it in the top-left corner.) Facing
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is 0 for right (>), 1 for down (v), 2 for left (<), and 3 for up (^). The final
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password is the sum of 1000 times the row, 4 times the column, and the facing.
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In the above example, the final row is 6, the final column is 8, and the final facing
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is 0. So, the final password is 1000 * 6 + 4 * 8 + 0: 6032.
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Follow the path given in the monkeys' notes. What is the final password?
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To begin, get your puzzle input.
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Answer: _____________________ [ [Submit] ]
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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/2022/about
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. https://adventofcode.com/2022/events
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. https://teespring.com/stores/advent-of-code
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. https://adventofcode.com/2022/settings
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. https://adventofcode.com/2022/auth/logout
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. Advent of Code Supporter
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https://adventofcode.com/2022/support
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. https://adventofcode.com/2022
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. https://adventofcode.com/2022
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. https://adventofcode.com/2022/support
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. https://adventofcode.com/2022/sponsors
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. https://adventofcode.com/2022/leaderboard
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. https://adventofcode.com/2022/stats
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. https://adventofcode.com/2022/sponsors
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. https://aoc.infi.nl/?mtm_campaign=aoc2022&mtm_source=aoc
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. https://adventofcode.com/2022/day/22/input
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. https://twitter.com/intent/tweet?text=%22Monkey+Map%22+%2D+Day+22+%2D+Advent+of+Code+2022&url=https%3A%2F%2Fadventofcode%2Ecom%2F2022%2Fday%2F22&related=ericwastl&hashtags=AdventOfCode
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. javascript:void(0);
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