day 10
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Acvaxoort
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day10/Cargo.lock
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day10/Cargo.lock
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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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version = 3
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[[package]]
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name = "day10"
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version = "0.1.0"
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day10/Cargo.toml
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day10/Cargo.toml
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[package]
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name = "day10"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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day10/input.txt
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day10/input.txt
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.|-J--7F7F-F|-F777F7J-J7F--7..-LJ7F|.F7L-77--F7|7.F-7-77.F.L---J.F---FLJF-F|77-|-----|-FL-J-|7-7FF.7--F7F7.F--F7.FF-F--J-.L-L77--77|---L7--7
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--7-L7.FJ7--JF---7F||.LL|J-7.FJ7.-JJ--JJ.||JFJLF.FJ-|7J7L7-L7JJ|77-J||JFLJJ.LL--7JFJJJ||FL.LJ|-7FFL.FJ|F-F-|J||L-L-LJL-7LJFLJJL--F77.LF.|F|F
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LJ7L|.L|..LF|JF-7L-7-7|L||7L|L7-7|7FF-JL|F|-J77L7FJ.L|--J|7LJ.|F7-F7||77J7.F7|LLL.|-|---7JF7-|-7-7|FJF7..LLJLLJ..L7LL-FL7FF-LFJ.FF.-|7LJ.-L|
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FJF7-7.|FL-7L||-|JFJ-|JJ||7J|F7F|JFL|.J7L--7LFJ||||L.L-|.-L.LF-JJJLFJL7..F|.|7...F7--.|F|.FJ7JFLJL|JFFL-7|FLLJL|-|-F.FF-7-LF.LJ-JL7||FJFJJLJ
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--J|.7.FJF7|7--7F7|-7J7.||L-LJ|7.||.7-||.|J|LFL7FLJ7F7JF-L|-F|F7FFFF7LF-F-7FLL-7.7L-J-FF--7F7F7JF--7FF7LL|-F--7JFJF7-FJ7LL77-|...FFLJJ7|JFJJ
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L|.LF-F7LLJJL|.JL||FLL|F|F|7|JL-77L..--J-F-|.LJ||--LJL||-||F-|.|-FFJ|F7-L7L7-7||F7.LJ|LL7FJ||||F7-L-7.-7||F-7LJ7L-|JLJ-77F|L|L-FJJ77|F|-JLJJ
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||.|.L|.||.LJ|.|.L-L7|L7L|.LJF-LL-LJ-|JJJ.|LFJFJ|7FL|-|JF-J77LLF-7L7LJL7||FJFF7LL77.FJ-L|L-JLJ||L7JJ.FL|L|7.FJL7LJ|F|.||7--7|F-7J-FJJ|||F|.F
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-FF-.|JLLJ|7.F.J-JJJL--|-J7LF|-|-|J-F||.F|-F7LJ.JJ-F-7|77|.LF.LL7|FL--7L-JL77LJ.F-J.F|7JL-7F--J|FJ|.|7-JJJLF7LLJ-|7.FJ-LJ.LLJF.|..|7-|.F---J
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LFJ7||.LFF-L7JF.7|7.LJ7L7JF-LJ77FF7.FF7F77F|L77.|7.L7|77-F777.F7|L7F--JF-7FJ7777L-FFF7F7F7||-F7||-F--J-|FFF||-|-777--J|FLFLJFJFL|.LL.F-J.FJ|
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|.J7.F|.FJ|JL-LJL-|7F|LFJFL7JLJ-FJ|F7|||||F|FJ7F7FF-J|F7FJL7F-7FJFJL7F-JFLJF7.F7LFF7|||LJ|||FJLJL7|J.L7J|JFJL7-F7F|7|.L--7JF7F|--7LLF77LL-J7
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F7J|-L-L-|-7FJLFJ|.L77F-L--777F|L7||||LJ|F-J|F7|F7L-7|||L-7|L7||FJF7|L--7F7|L7|L--JLJ|L-7||||F---JF-7-|7JFL-7|FJ|FJJF7F7J..|L|77L|F|L-7J|L.|
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F-JLJLJJJ.|LJ7FF-F-FJJ|JJ.F-JJ7F7|LJLJF-JL-7|||F||J|||||F7||L|LJL-J||F--J|||FJL-7F--7L--JLJ||L7F--JFJLF7FF7FJ|L7L7FFJ|F7JL-|7|L|JL-7FFL.7---
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..||-|F--JJ-FFLJ||-||-|--7|7FFF||L7F7FJF-7FJLJL7||F7|||||LJL7L----7||L7F7|||L--7LJ7.L7F--7FJL7||F--JF7|L7|LJFJFJFJFJFJ||7JFFF.||LJ..J||FF7||
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|7F7.|J.LLL-7J-L-7JL77.-F-J--|L|L7LJ|L7|FJL-7F-J|||||LJ|L7F-JF7F7FJLJFJ|||LJF--JFF7F-J|F7||F7|LJL-7L||L7||F7|FJFJL|FJFJL7FF7J--F7|J..L-|JL-J
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.-JJ7|LFJF--|.|.||7.LJ7.-JJ|.7-L7|F7L7||L-7FJL7FJ||||F-JFJ|F-J|||L--7L7|||F-JF7F7|||F-J|LJLJLJF--7L7||FJ|LJ||L7L-7|L7L7FJF7F7|LF-7JL7|7|7J|J
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|J7L|L.|FJJ-|.F-JJJFJJ|..|7LF---J|||7|||F-JL7FJL7||LJL7|L7|L-7LJL7F-JFJ|||L--J|||||LJF7L----7FJF7L-J||L7L7FJ|J|F-JL7|FJL7||||-FJFJ-L|-L7--FJ
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JL7.JLF|JL7JLFLJ..FJ7.|-FJ7FL-7F7LJL7|LJL77FJ|F7|||F--JF7||F7L--7LJF7L7|LJF---J|LJL7FJL--7F-JL-J||F7||FJFJL7L7||F-7||L-7|||||.L7L7JLL-|J|.|7
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FF|-L7-7F-7.F|F77-F|LFJFJ|LF7.||L--7|L-7FJFJFJ|LJ||L7F7|LJLJ|7F7L7FJL-J|F-JF7JLL-7FJL---7|L--7F-JFJ|||L7|JFJFJ|LJFJ||FFJLJLJL-7|FJ-F|7|FF7.F
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F777--FJJJLF-|-LL.FJ7FFF-7J|L7LJF7J|L--J|-|FJF|F7LJFJ||L---7L-JL7|L---7||F7|L7JF7|L7F7F7||F77|L-7|FJ|L7|L7L7|-L7FJFJ|FJF------J|L77-J-LFJ77J
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L-J777|-|LL|7LJ|L--.F7||FJ-L7L--JL7L---7L7||F7LJL7FJ-|L7F77L---7||F---J||||L7|FJ||FJ|LJ||LJL-JF-J||FJFJL7|FJ|F7||||FJL7|.F7F---JFJ--7F-J||F7
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.|-F7-7.77.LL--JJJF-.FFJ|7JLL7F-7FJF---JFJ||||FF7||F7L7LJL7LF7F||||F-7FJLJL7||L7|||7L-7|L-7F-7|F7||L7L--J|L7LJ||L-J|F7||FJLJF-7FJ7J7.J|FL-F7
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7-J|J..FLFL7F7J||.F|F-JFJF7F7||FJ|-L---7|FJ|||FJ||||L7L--7L-JL-JLJ||FJ|F---J||FJ||L7JFJ|F7|||LJ|||L7L---7L7L7FJ|F--J|||||F--J7LJ-LF77.77J.|J
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L7FJF7-7FL-JJJ.F-7--L-7|L||||LJL7|F7F--J||FJ|||FJ||L7L-7|L--7F---7LJL-J|F77FJLJFJL7L7L7||LJL7F7||L7L7F--JFJFJL7|L-7FJ||LJL-7F7F-7-||7-LL-L|7
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.L|-7.FLJ.-|JJ-7FF7.|FJL7||||LF-J|||L7F7LJ|FJ|||FJL7|F-JF-7-LJF7FL7F---J||FJF-7|F-JFJFJ|L--7|||||J|FJL--7L-JF7LJF-JL7LJF7F7||LJFJ-||J.7-7.|7
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|.|.F.77||.-7J.|F-J-LL-7LJ||L7L-7||L7LJL7FJL7|||L-7LJL7LL7L7F-JL--JL7F-7|LJFJJLJL7FJFJFJF7FJLJ||L-JL7F7LL7F7|L--JF--JF7||||LJF7L--J|-7L-JLJJ
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|-|-JF|-FJ.LJ777F77|.F7L-7|L7L-7||L7|F--J||FJ|||-FJF--JF-JFJL------7||FJL-7L7F7F-JL7L7|FJ|L7F-J|F--7|||F7LJ|L7F-7|F7FJLJLJ|F-J|F--7|.|J|.L7J
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LJJ7FLLF-F.L|LF7||F-7|L7FJL7L-7||L7||L--7L7L7||L7|FJF7.L-7|F7F-----JLJL-7-L7|||L--7|FJ|L7|FJL-7LJF7||||||F7|FJL7||||L----7LJF7LJF7LJFL-|7LL.
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.|FFFJJ|JFLF-7|||||FJ|FJL-7|F7|LJFJ||F7LL7L-JLJFJ|L-JL-7FJ|||L-----7F---JF7|LJ|F7FJ|L7|-|||F--JF-J||LJ|||||||F7||||L-----JF-JL77||J.FJ||F-LF
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LFJJJLFLF7|L7LJLJLJL7||F-7||||L-7L-J|||F7L-7F--JFJF--7FJL7|||LF----J|F7LFJLJF-J||L7L-JL-JLJL7FFJF7|L-7LJ||LJ||||||L-----7FJF-7L7|L--7FFL-7-|
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||||L777|L7LL-----7FJ||L7|||||F7L7F-J||||F-J||F7|FJF7LJ7FJ||L7L----7LJL7L--7|F7|L7L---7F7F-7|FJFJLJF7L-7||F7LJLJLJF-7F--J|FJ.L7LJF--JJJL.---
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FL|77JF-L7|F------J|FJL-J||||LJ|L||F7||||L-7L7|||L7||F7FJFJL7|F7F--JF--JF-7|LJ||FJJF-7LJLJF|LJFJF7FJL7FJ|||L------J||L---JL7F7L--JJFL-LL|.J.
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J.|J7-L-FJ||F-----7||F---J||L7FJFJ||||||L--JFJ|||FJ|||LJFJF7||||L--7L--7L7||F-J|L-7|FJ|F7F-JF-J7|||F7|L7||L--------7|F7F7F7LJL--7L--J..L77|.
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FF-.L|FF7||F7L7|L---7F-JL7FJL-7||L7|LJ|F7F7||L--7LJFJF7L7||||||L7|||L7F7L-7F----JF7|||||L7|L-7|||L7FJLJF7FJ||||LJLLJ|L-7LJ|L-----77||--|.FJ|
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-JFL-L-7||LJ|L-------7|||L-7F-7L7||F7|||||LJ|FJLJ|F7FJ|FJ||||L7|||||L7|||||||LJL7|||||||L7|L7FJL7|L7F7||F----77|F--JJLJ|||LLJLJF7F-7FL-7-|F7
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.LJJ7L----JL--7|||L--7LJ|||LJL7L-JLJ||LJ|F7||FJL7FJ|FJLJ|FJ||L7|||||L7||||||FJL-7||L-7LJFJ|L7FJFJFJ||||F-JLJ.FJF7||FJFJF--7LJLJF-7|.|..77..|
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F-JJFF7F------JLJL77FJF7|||LF7L----7LJF7|||||L7FJ|FJL-7.LJFLJFJ|LJ||FJ||||||L--7|||F7|F-JFJJ|||L7|L||||L----7|FJ|LJL-JFJF7L7F-7L7LJ7-77L7--|
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||FJFFJ|-F--JFJF7FFJFJ-L-JL-7FJF------JL-JLJFJFJF--JL--JF-7L7|L7|L7||L-JL7L7L7||||FJL-JLJ|L7L7||||FJL7F-7F-------J|L-JL7||||||||F7|.LF7.-|7.
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FL7.|.|JLL---7F-7|LJL----7||L7F-7F-JLJ||FJF7|||-L7FJFF-7|L--7F7|||F-7|FJL--7FJL7FJL7L7L7L7|FJ|LJLJ|F7FJ|L---7|FJL7FJL7F7||L---J||F--JJJF.F-J
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|.|F-7.|JLF7F|||LJFF7FF7FJLJFJL7LJF-7-LJL-JLJLJF-JL--JFJL-7FJ|LJLJ|-|||F7F-JL7FJ|F7||L7L7LJL7L7F--7||L7|F---JLJ|FLJF7LJLJL-----J|L-77-7JLJF-
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.||JLFJ7J7LL-7|L-----7L7||F7L-7|L---JFJ|L-7LJLJL7||L--JLJF-J||L7|||||JL7FJ|F7FJ|FJF7L7LJL7|||FJ||.LJLJL7LJF7L-7L-JLJLJF-7FJLJF-7LJLJJF7-LJ7.
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LFF7L7.J-||.FJL-----7L7LJLJL--J|F7F-7|LL--J|F7F7LJ|F----7L--J|.||||LJF-JL-J|LJFJL7|L-JF7FJ||LJ|||F7F---JF-J|F7|F-7F7F7L7||F--JFJ|7|L-F-7F-77
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|JL|F|7J.F-7L-7F7F7FJLL-7F----7|||L7|L7F7F7FJLJL-7|L---7|F7F7L7|||L7JL-7F-7L-7L7FJL7F7||L7LJF--JLJ|L----JF7LJ||L7|||||FJ|LJF-7L7F77..LLLJ-J|
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.7F|FF7-F|FJF7||LJ|||F7FJL7F--JLJL-JL-J||||L7F---JL7F7FJLJ|||FJLJ|FJF--J|FJF-JFJ|F-J|LJL-JF7L----7|F7F7F7|L-7|L-JLJLJ||FL-7L7L7LJL777-JF-.||
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||FLFJL7FJL-J|LJF7|L-JLJF7|L7F---------JLJ|FJL--7F7|||L7FFJ|LJF7LLJFL--7|L7L7FJFJL7FJF----JL7F-7FJ||LJLJLJF7LJLF7F--7|L--7L-J.L-7FJ.J..|.FJ|
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FL7-L-7|L---7|F-JLJF-7F-JLJFJ|F-----------J|F---J||LJL7L7L7L--JL-7F----JL7L7LJFJF7LJFJF7F7F7|L7|L7|L--7F--JL-7FJLJF-J|F-7L7JF7F7LJ77|FL-FLF-
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.FJ.LL7LJLJF-7FJF-JL7LFJLJF-JF7F-----7F--------J|F---JLJJFJL-7||||LJF--JL-7||L7F7F-JF---7F7L-----7LJLJFJL---7F7||F-JL---7|F7F---J|||LJ--|.--
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F7J|-LL7F-7|FJ|-L---JFJF--JF-J||F---7|L-------7L|L----7F7|F7FJ||LJF7L--7F-J||FJ||L-7L--7LJL------JF7F7|F----J|LJLJF7F---J||LJF7F-J|J77.FF-J|
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|J.|L|-LJJ||L7|F-----JFJF--JF7LJL7F-JL--------JFJF----J||LJLJ7LJF-JL---J|F-J|L7|L--JF-7L7F7F--7F7FJLJLJL-----JF7F7|LJF7FFJL--JLJF-J|7-7.J7|7
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L.||LJ7|7FJ-|J-JF7--L7F7|L-7||||F7||||L-7F7LJL7L7F-JL-7FL7|LJ||JLJL7F7L-7||-F-7L--7||L7|FJ||||FJLJ|FJL7||FJF7L-7L77.|.77|F-F7J77.LJJJF-JJL77
|
||||||
|
LF-JLFJ-LL-JJL.|FJ.LFJ|LJ7FJ|LJLJ|||||F7LJL-77L7||F7F7L-7|L-7||F---J||F-J|L7L7L---J||FJLJ7LJLJL7F7||F7L7|L-JL-7|FJ-7JFLFJL7.J.L|7-|LF--||FLJ
|
||||||
|
FLJL-JJFLJ7|.|.FLL-JL-JF-7|FJF-7FJ|||||L7F7FJF-J|LJ|||F7|L--J|||F-7FJ|L-7|FJFJF---7||L------7F-J|LJLJL7LJF----JLJLF|.F|J|LJFFJ|LF---J--JLLJ|
|
||||||
|
|-77|.F|.LJF---L7.J7JJLL7LJL7L7LJFJ||||FJ|||F|F7L7FJ|||LJJ-|.||||FJL7|F7|||.L-JF--J|L7F7F---JL-7L7F--7|F-JFF---7JFLJ-J|-F|JFJ--F77F-|-L..||L
|
||||||
|
7.77|7|-.L-.|..L7F-|LF--JF-7L7L7FJFJ|||L7||L7||L7|L7||L7-77FLLJLJL7FJ||LJ||F---JF-7L7||LJF7-F7||FJL-7LJL--7L7F7|-J.J-7J7J|L-..LJJJ77LFJFJL|J
|
||||||
|
L7L--7|FFJL-7J7-L----L7F7|-|FJFJ|FJFJLJ-LJ|FJLJJ||F||L-J7L77JLL.|FLJ-|L-7LJ|F7F7L7L7||L-7|L7||FJL-7-L7F7F7L-J|||J77..L7.FJF.|7.J77|LF7|LL7JJ
|
||||||
|
FF7L|LJJJ-.JLL-.|77--FJ|LJFJ|FL7|L7L-7F---JL--7FJ|FJL---7JLJFL7-FFF--JF-JJJLJ|||FJ|LJ|F7|L7LJLJF-7|F-J|LJL---JLJF|77LJL-J7.FJF|LF|FFLL7--L7.
|
||||||
|
7L7--LJ7.|.|JJL.F77L|L-JJ7L-J-LLJ-L7FJL7F7F7F7|L7|L7F7F-J-FJ|-77L.L--7|JJ.|F|||||F---J|||FJF-7FJFLJL-7L-------7J7JL|F7J-JFJJ.|7-7|F|JF|-7F-J
|
||||||
|
|-J|7.FL-7L7LF-|JF7-7|FLLJJ7J|JJFLL||J|LJ||LJ||JLJF||LJ-JFF-77.--F77FJL7.L77FLJ||L---7|LJL-JFJL--7F--JF-7F-7F-J.|LL7J|J.|F7F-J-77-|J.|-FJFL7
|
||||||
|
JFF-J.L-J-||-J.|7LLL-JF-JL-7-L.LJ|.LJL|JL|L7LLJ-LL-LJ.L.F-JFJ-JF-|L-JF-J-.L7F.FJL7F--J|-F7F-JF-7FJ|F7FJFJ|FJL-7.L-7JFL7-FJJ7||||J-|--L.JL|FL
|
||||||
|
L7JFLF7||LFL-||.7J.|F7LJ-----F|-LFL77LL..L-J.|JL|-FLJ-7--|-J|FJ7|L7F7L7JFJ-|JFL7FJL--7L7|||F7|||L7LJ|L7|FJL7F-J7.JJ-|-L-LJFLL7LJ...L||FJ..J|
|
||||||
|
LJ77LLL7JF77FLL|J.F-JLJJ7-7L--J|.|F--JFF-J|-L7.LL--JFLLJ|L-.F-|F--J||FJ.LJ-J.FLLJ-||LL7||LJ|||FJFJF-JFJ|L7FJ|F7L|F7J.FJ...|7F-|7|-7.--7.-.LF
|
||||||
|
LLF--JLJ--FJJ7.|JF77J|L-|.||LF--7|7F|F-JJJ|-|J|FLFJ-LJJFJ7F7L--L--7|||J.F|-FJ-7LL7|L-FJ|L7FJ||L7L7L-7L7L7|L7LJL7L-J-777.F.LFFLF-|7||.F-.|.F.
|
||||||
|
..LJ--7JF|.LL-FJ7J|LF-JF7-FF-L-7LL7FF-||JJL7-.L|FJLF.F|-FFFF-|JF||LJ||FJ-|-|J7|J|-LJLL-J|||-LJFJFJLFJFJ.||FJF7FJ7.F.LL-7F7.FJ-|J.7F77L.|JFJ7
|
||||||
|
LL---J|LFJ-.|-|F7--JLJF|.|FJ.|FL-7F7.F---7||...L|L77-777|FJ|7-F--7|FLJ7.F|LJ.|.-JJ..||7LLLJ7.FJFJFFJFJ|.LJL7|LJJF-J77.LFJL--7F|-LJFJF.FL7.LJ
|
||||||
|
LJLJ7.-77..L77JL---L7FFJ|-||7|JJF|JJ7.|7LFF-.F--JF|JF7.FLJ-J|7|FLJJ77.L-|--F-LL--77F|-L7J.LJFL7L7FJFJL7.LL.LJFL-J7-L7F|L|JJ|LLFFJF-.L7JLF--|
|
||||||
|
F-7JFFJLJF|JLL..|JF7LJJ-F7FL-J--FJ|FF-J|FLJJ.-L7-L7-7.-JFLF|-F|JL|JF--|JLJL|7JJF|JLF-7LF7FFFJFL-JL-JJ..|.|F|.7F-FF77F7LF7|.|...F7|F--J77L--J
|
||||||
|
|.L-7J-L7-JLLL--L-FL--LJ.LLJLJ-L|-7JJLL--J-L-J.JJ.L-J-J.LJ|JJJJ7.J-FJLL-L-.J---FJ..|.|.L|7.|.LLJ.|JJ.FF--L-L7JL-F7-FJ|-7J|7L7-|LJ.LJ-LJ7--J-
|
||||||
192
day10/src/main.rs
Normal file
192
day10/src/main.rs
Normal file
@ -0,0 +1,192 @@
|
|||||||
|
use std::cell::UnsafeCell;
|
||||||
|
use std::fs::read_to_string;
|
||||||
|
|
||||||
|
fn main() {
|
||||||
|
let input_str = read_to_string("input.txt").unwrap();
|
||||||
|
// the layout as in the file
|
||||||
|
let layout = input_str.lines().map(|str| str.as_bytes()).collect::<Vec<_>>();
|
||||||
|
let layout_width = layout[0].len();
|
||||||
|
let layout_height = layout.len();
|
||||||
|
// Double the sizes
|
||||||
|
let layout_width2 = layout_width * 2;
|
||||||
|
let layout_height2 = layout_height * 2;
|
||||||
|
// layout at double the resolution with spaces between each segment for task 2
|
||||||
|
// E - enclosed, M - main loop, O - outside
|
||||||
|
let mut layout_enclosing = vec![vec![b'E'; layout_width2]; layout_height2];
|
||||||
|
// Step counter for task 1
|
||||||
|
let mut steps = 1;
|
||||||
|
unsafe {
|
||||||
|
#[derive(Clone, Copy, Debug)]
|
||||||
|
enum Direction {
|
||||||
|
Left,
|
||||||
|
Right,
|
||||||
|
Up,
|
||||||
|
Down,
|
||||||
|
}
|
||||||
|
// Pipe walker, a structure that describes an abstract entity walking around the pipes
|
||||||
|
#[derive(Clone, Copy)]
|
||||||
|
struct PipeWalker {
|
||||||
|
x: usize,
|
||||||
|
y: usize,
|
||||||
|
dir: Direction,
|
||||||
|
}
|
||||||
|
let layout_enclosing_cell = UnsafeCell::new(layout_enclosing);
|
||||||
|
// Functions that move the walker around the pipes
|
||||||
|
// also leaves a trail of M's in the layout_enclosing
|
||||||
|
// They use an unsafe cell because otherwise the closures would have a borrow conflict
|
||||||
|
let move_left = |walker: &mut PipeWalker| {
|
||||||
|
let layout_enclosing_mut = &mut *layout_enclosing_cell.get();
|
||||||
|
layout_enclosing_mut[walker.y * 2][walker.x * 2 - 1] = b'M';
|
||||||
|
layout_enclosing_mut[walker.y * 2][walker.x * 2 - 2] = b'M';
|
||||||
|
walker.x -= 1;
|
||||||
|
walker.dir = Direction::Left;
|
||||||
|
};
|
||||||
|
let move_right = |walker: &mut PipeWalker| {
|
||||||
|
let layout_enclosing_mut = &mut *layout_enclosing_cell.get();
|
||||||
|
layout_enclosing_mut[walker.y * 2][walker.x * 2 + 1] = b'M';
|
||||||
|
layout_enclosing_mut[walker.y * 2][walker.x * 2 + 2] = b'M';
|
||||||
|
walker.x += 1;
|
||||||
|
walker.dir = Direction::Right;
|
||||||
|
};
|
||||||
|
let move_up = |walker: &mut PipeWalker| {
|
||||||
|
let layout_enclosing_mut = &mut *layout_enclosing_cell.get();
|
||||||
|
layout_enclosing_mut[walker.y * 2 - 1][walker.x * 2] = b'M';
|
||||||
|
layout_enclosing_mut[walker.y * 2 - 2][walker.x * 2] = b'M';
|
||||||
|
walker.y -= 1;
|
||||||
|
walker.dir = Direction::Up;
|
||||||
|
};
|
||||||
|
let move_down = |walker: &mut PipeWalker| {
|
||||||
|
let layout_enclosing_mut = &mut *layout_enclosing_cell.get();
|
||||||
|
layout_enclosing_mut[walker.y * 2 + 1][walker.x * 2] = b'M';
|
||||||
|
layout_enclosing_mut[walker.y * 2 + 2][walker.x * 2] = b'M';
|
||||||
|
walker.y += 1;
|
||||||
|
walker.dir = Direction::Down;
|
||||||
|
};
|
||||||
|
let mut walkers: Vec<PipeWalker> = vec![];
|
||||||
|
walkers.reserve(2);
|
||||||
|
// Find the starting position and starting walkers
|
||||||
|
for (j, &row) in layout.iter().enumerate() {
|
||||||
|
for (i, &elem) in row.iter().enumerate() {
|
||||||
|
if elem == b'S' {
|
||||||
|
(&mut *layout_enclosing_cell.get())[j * 2][i * 2] = b'M';
|
||||||
|
if i > 0 {
|
||||||
|
let elem2 = layout[j][i - 1];
|
||||||
|
if elem2 == b'-' || elem2 == b'L' || elem2 == b'F' {
|
||||||
|
walkers.push(PipeWalker { x: i, y: j, dir: Direction::Left });
|
||||||
|
move_left(walkers.last_mut().unwrap());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if i < layout_width - 1 {
|
||||||
|
let elem2 = layout[j][i + 1];
|
||||||
|
if elem2 == b'-' || elem2 == b'J' || elem2 == b'7' {
|
||||||
|
walkers.push(PipeWalker { x: i, y: j, dir: Direction::Left });
|
||||||
|
move_right(walkers.last_mut().unwrap());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if j > 0 {
|
||||||
|
let elem2 = layout[j - 1][i];
|
||||||
|
if elem2 == b'|' || elem2 == b'F' || elem2 == b'F' {
|
||||||
|
walkers.push(PipeWalker { x: i, y: j, dir: Direction::Left });
|
||||||
|
move_up(walkers.last_mut().unwrap());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
if j < layout_height - 1 {
|
||||||
|
let elem2 = layout[j + 1][i];
|
||||||
|
if elem2 == b'|' || elem2 == b'J' || elem2 == b'L' {
|
||||||
|
walkers.push(PipeWalker { x: i, y: j, dir: Direction::Left });
|
||||||
|
move_down(walkers.last_mut().unwrap());
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
// Walk around the main pipe loop, count steps for task 1
|
||||||
|
loop {
|
||||||
|
let advance_walker = |walker: &mut PipeWalker| {
|
||||||
|
match walker.dir {
|
||||||
|
Direction::Left => {
|
||||||
|
match layout[walker.y][walker.x] {
|
||||||
|
b'-' => move_left(walker),
|
||||||
|
b'L' => move_up(walker),
|
||||||
|
b'F' => move_down(walker),
|
||||||
|
_ => {}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Direction::Right => {
|
||||||
|
match layout[walker.y][walker.x] {
|
||||||
|
b'-' => move_right(walker),
|
||||||
|
b'J' => move_up(walker),
|
||||||
|
b'7' => move_down(walker),
|
||||||
|
_ => {}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Direction::Up => {
|
||||||
|
match layout[walker.y][walker.x] {
|
||||||
|
b'|' => move_up(walker),
|
||||||
|
b'7' => move_left(walker),
|
||||||
|
b'F' => move_right(walker),
|
||||||
|
_ => {}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
Direction::Down => {
|
||||||
|
match layout[walker.y][walker.x] {
|
||||||
|
b'|' => move_down(walker),
|
||||||
|
b'J' => move_left(walker),
|
||||||
|
b'L' => move_right(walker),
|
||||||
|
_ => {}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
};
|
||||||
|
steps += 1;
|
||||||
|
advance_walker(&mut walkers[0]);
|
||||||
|
if walkers[0].x == walkers[1].x && walkers[0].y == walkers[1].y {
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
advance_walker(&mut walkers[1]);
|
||||||
|
if walkers[0].x == walkers[1].x && walkers[0].y == walkers[1].y {
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
layout_enclosing = layout_enclosing_cell.into_inner();
|
||||||
|
}
|
||||||
|
// Flood the layout from edges to determine what is enclosed
|
||||||
|
let mut to_flood: Vec<(u16, u16)> = vec![];
|
||||||
|
to_flood.extend((0..layout_width2).map(|x| (x as u16, 0u16)));
|
||||||
|
to_flood.extend((0..layout_width2).map(|x| (x as u16, (layout_height2 - 1) as u16)));
|
||||||
|
to_flood.extend((1..layout_height2 - 1).map(|x| (0u16, x as u16)));
|
||||||
|
to_flood.extend((1..layout_height2 - 1).map(|x| ((layout_width2 - 1) as u16, x as u16)));
|
||||||
|
loop {
|
||||||
|
if to_flood.is_empty() {
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
let &(x, y) = to_flood.last().unwrap();
|
||||||
|
to_flood.pop();
|
||||||
|
// If an unflooded E (enclosed) is found, convert it to O (outside) and flood neighbours
|
||||||
|
if layout_enclosing[y as usize][x as usize] == b'E' {
|
||||||
|
layout_enclosing[y as usize][x as usize] = b'O';
|
||||||
|
if x > 0 {
|
||||||
|
to_flood.push((x - 1, y));
|
||||||
|
}
|
||||||
|
if x < layout_width2 as u16 - 1 {
|
||||||
|
to_flood.push((x + 1, y));
|
||||||
|
}
|
||||||
|
if y > 0 {
|
||||||
|
to_flood.push((x, y - 1));
|
||||||
|
}
|
||||||
|
if y < layout_height2 as u16 - 1 {
|
||||||
|
to_flood.push((x, y + 1));
|
||||||
|
}
|
||||||
|
}
|
||||||
|
}
|
||||||
|
// Count enclosed space for task 2
|
||||||
|
let count_enclosed = layout_enclosing.iter()
|
||||||
|
.step_by(2)
|
||||||
|
.fold(0, |acc, row| {
|
||||||
|
acc + row.iter()
|
||||||
|
.step_by(2)
|
||||||
|
.fold(0, |acc, &elem| acc + if elem == b'E' { 1 } else { 0 })
|
||||||
|
});
|
||||||
|
println!("Steps: {}", steps);
|
||||||
|
println!("Enclosed: {}", count_enclosed);
|
||||||
|
}
|
||||||
Loading…
Reference in New Issue
Block a user