96 lines
3.2 KiB
Plaintext
96 lines
3.2 KiB
Plaintext
Advent of Code
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--- Day 19: A Series of Tubes ---
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Somehow, a network packet got lost and ended up here. It's trying to follow a routing diagram (your puzzle input),
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but it's confused about where to go.
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Its starting point is just off the top of the diagram. Lines (drawn with |, -, and +) show the path it needs to
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take, starting by going down onto the only line connected to the top of the diagram. It needs to follow this path
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until it reaches the end (located somewhere within the diagram) and stop there.
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Sometimes, the lines cross over each other; in these cases, it needs to continue going the same direction, and
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only turn left or right when there's no other option. In addition, someone has left letters on the line; these
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also don't change its direction, but it can use them to keep track of where it's been. For example:
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| +--+
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A | C
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F---|----E|--+
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| | | D
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+B-+ +--+
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Given this diagram, the packet needs to take the following path:
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• Starting at the only line touching the top of the diagram, it must go down, pass through A, and continue
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onward to the first +.
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• Travel right, up, and right, passing through B in the process.
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• Continue down (collecting C), right, and up (collecting D).
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• Finally, go all the way left through E and stopping at F.
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Following the path to the end, the letters it sees on its path are ABCDEF.
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The little packet looks up at you, hoping you can help it find the way. What letters will it see (in the order it
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would see them) if it follows the path? (The routing diagram is very wide; make sure you view it without line
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wrapping.)
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Your puzzle answer was __________________.
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--- Part Two ---
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The packet is curious how many steps it needs to go.
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For example, using the same routing diagram from the example above...
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| +--+
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A | C
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F---|--|-E---+
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| | | D
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+B-+ +--+
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...the packet would go:
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• 6 steps down (including the first line at the top of the diagram).
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• 3 steps right.
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• 4 steps up.
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• 3 steps right.
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• 4 steps down.
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• 3 steps right.
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• 2 steps up.
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• 13 steps left (including the F it stops on).
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This would result in a total of 38 steps.
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How many steps does the packet need to go?
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Your puzzle answer was _________.
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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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References
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Visible links
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. http://adventofcode.com/
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. http://adventofcode.com/2017/about
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. http://adventofcode.com/2017/support
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. http://adventofcode.com/2017/events
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. http://adventofcode.com/2017/settings
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. http://adventofcode.com/2017/auth/logout
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. http://adventofcode.com/2017
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. http://adventofcode.com/2017
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. http://adventofcode.com/2017/leaderboard
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. http://adventofcode.com/2017/stats
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. http://adventofcode.com/2017/sponsors
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. http://adventofcode.com/2017/sponsors
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. https://teespring.com/advent-of-code
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. https://teespring.com/advent-of-code-eu
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. http://adventofcode.com/2017
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. http://adventofcode.com/2017/day/19/input
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