Use iterators instead of explicit indexing

230 byte overhead is worth it to avoid conversions and potential
indexing errors

2022/Cargo.toml

@@ -8,6 +8,7 @@ edition = "2021"
 [dependencies]
 anyhow = "1.0.66"
 clap = { version = "4.0.19", features = ["derive"] }
+itertools = "0.10.5"
 nom = "7.1.1"
 
 [dev-dependencies]

2022/benches/days.rs

@@ -8,7 +8,7 @@ use criterion::BenchmarkId;
 use criterion::Criterion;
 
 /// Number of days we have an implementation to benchmark
-const DAYS_IMPLEMENTED: u8 = 2;
+const DAYS_IMPLEMENTED: u8 = 6;
 
 fn read_input(day: u8) -> Vec<u8> {
     let input_path = format!("inputs/{:02}.txt", day);

2022/inputs/03.txt

@@ -0,0 +1,300 @@
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2022/inputs/05.txt

@@ -0,0 +1,514 @@
+        [G]         [D]     [Q]    
+[P]     [T]         [L] [M] [Z]    
+[Z] [Z] [C]         [Z] [G] [W]    
+[M] [B] [F]         [P] [C] [H] [N]
+[T] [S] [R]     [H] [W] [R] [L] [W]
+[R] [T] [Q] [Z] [R] [S] [Z] [F] [P]
+[C] [N] [H] [R] [N] [H] [D] [J] [Q]
+[N] [D] [M] [G] [Z] [F] [W] [S] [S]
+ 1   2   3   4   5   6   7   8   9 
+
+move 7 from 6 to 8
+move 5 from 2 to 6
+move 2 from 4 to 1
+move 1 from 4 to 5
+move 5 from 7 to 6
+move 7 from 6 to 3
+move 5 from 9 to 2
+move 6 from 2 to 3
+move 2 from 7 to 9
+move 20 from 3 to 1
+move 11 from 1 to 6
+move 1 from 9 to 8
+move 3 from 8 to 2
+move 8 from 1 to 5
+move 10 from 8 to 4
+move 7 from 6 to 4
+move 1 from 8 to 3
+move 8 from 1 to 7
+move 16 from 4 to 8
+move 1 from 9 to 8
+move 1 from 5 to 2
+move 4 from 7 to 4
+move 5 from 6 to 7
+move 1 from 6 to 1
+move 8 from 7 to 4
+move 1 from 6 to 9
+move 12 from 4 to 5
+move 3 from 2 to 5
+move 1 from 6 to 2
+move 1 from 3 to 7
+move 1 from 3 to 2
+move 1 from 9 to 3
+move 1 from 7 to 8
+move 1 from 7 to 5
+move 1 from 3 to 2
+move 4 from 5 to 7
+move 5 from 5 to 7
+move 1 from 4 to 3
+move 1 from 3 to 9
+move 3 from 1 to 8
+move 1 from 9 to 1
+move 2 from 2 to 1
+move 2 from 2 to 7
+move 8 from 8 to 1
+move 3 from 5 to 2
+move 8 from 7 to 5
+move 7 from 1 to 3
+move 3 from 1 to 7
+move 1 from 1 to 5
+move 1 from 3 to 7
+move 7 from 5 to 8
+move 2 from 2 to 8
+move 1 from 3 to 2
+move 1 from 2 to 4
+move 1 from 4 to 8
+move 13 from 8 to 1
+move 13 from 5 to 9
+move 2 from 5 to 2
+move 7 from 9 to 3
+move 12 from 8 to 3
+move 4 from 9 to 3
+move 1 from 3 to 4
+move 2 from 2 to 3
+move 1 from 1 to 6
+move 1 from 2 to 3
+move 1 from 5 to 9
+move 7 from 7 to 4
+move 10 from 1 to 8
+move 1 from 1 to 4
+move 1 from 9 to 5
+move 2 from 5 to 1
+move 1 from 6 to 5
+move 3 from 8 to 9
+move 5 from 4 to 3
+move 4 from 4 to 1
+move 7 from 1 to 6
+move 2 from 5 to 7
+move 35 from 3 to 4
+move 4 from 9 to 1
+move 19 from 4 to 8
+move 1 from 7 to 6
+move 1 from 9 to 2
+move 10 from 4 to 5
+move 2 from 4 to 7
+move 3 from 4 to 3
+move 1 from 2 to 8
+move 1 from 1 to 9
+move 3 from 3 to 6
+move 4 from 8 to 6
+move 4 from 5 to 2
+move 2 from 8 to 3
+move 3 from 5 to 9
+move 12 from 6 to 1
+move 8 from 8 to 6
+move 2 from 9 to 1
+move 1 from 4 to 1
+move 1 from 3 to 8
+move 3 from 7 to 8
+move 2 from 9 to 7
+move 1 from 6 to 7
+move 10 from 6 to 8
+move 4 from 2 to 5
+move 1 from 3 to 7
+move 7 from 5 to 7
+move 13 from 8 to 1
+move 29 from 1 to 4
+move 8 from 7 to 8
+move 1 from 1 to 3
+move 3 from 7 to 6
+move 1 from 1 to 9
+move 15 from 4 to 1
+move 1 from 3 to 6
+move 10 from 1 to 6
+move 10 from 6 to 7
+move 1 from 4 to 9
+move 1 from 9 to 1
+move 1 from 9 to 7
+move 6 from 7 to 8
+move 1 from 1 to 6
+move 5 from 6 to 5
+move 21 from 8 to 9
+move 5 from 1 to 9
+move 2 from 9 to 5
+move 3 from 5 to 6
+move 3 from 7 to 9
+move 4 from 4 to 6
+move 6 from 8 to 7
+move 6 from 6 to 3
+move 2 from 7 to 9
+move 1 from 7 to 2
+move 6 from 3 to 2
+move 1 from 6 to 4
+move 4 from 5 to 9
+move 1 from 4 to 5
+move 9 from 4 to 6
+move 7 from 6 to 4
+move 10 from 9 to 2
+move 5 from 7 to 5
+move 10 from 2 to 7
+move 2 from 5 to 4
+move 2 from 5 to 9
+move 4 from 9 to 4
+move 1 from 8 to 6
+move 7 from 7 to 2
+move 1 from 5 to 4
+move 2 from 7 to 1
+move 1 from 5 to 7
+move 3 from 6 to 2
+move 4 from 4 to 5
+move 1 from 2 to 7
+move 10 from 4 to 7
+move 3 from 7 to 3
+move 17 from 9 to 4
+move 1 from 1 to 4
+move 1 from 1 to 5
+move 5 from 2 to 7
+move 1 from 9 to 2
+move 5 from 4 to 8
+move 2 from 9 to 7
+move 4 from 8 to 1
+move 3 from 4 to 8
+move 1 from 2 to 5
+move 1 from 9 to 2
+move 6 from 4 to 8
+move 3 from 7 to 5
+move 1 from 4 to 9
+move 1 from 9 to 1
+move 3 from 1 to 9
+move 4 from 8 to 5
+move 2 from 9 to 8
+move 4 from 2 to 5
+move 8 from 7 to 2
+move 5 from 8 to 5
+move 2 from 7 to 8
+move 1 from 3 to 5
+move 1 from 1 to 2
+move 1 from 1 to 6
+move 2 from 3 to 6
+move 5 from 2 to 8
+move 4 from 7 to 1
+move 7 from 8 to 5
+move 1 from 1 to 5
+move 3 from 8 to 3
+move 1 from 9 to 3
+move 7 from 2 to 3
+move 2 from 2 to 8
+move 2 from 4 to 8
+move 1 from 8 to 5
+move 1 from 1 to 4
+move 2 from 4 to 7
+move 2 from 7 to 1
+move 3 from 2 to 3
+move 3 from 5 to 2
+move 1 from 8 to 3
+move 3 from 3 to 2
+move 5 from 2 to 1
+move 17 from 5 to 8
+move 9 from 8 to 1
+move 11 from 3 to 5
+move 8 from 8 to 5
+move 2 from 8 to 5
+move 16 from 1 to 4
+move 13 from 4 to 7
+move 6 from 5 to 2
+move 2 from 4 to 8
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+move 2 from 1 to 2
+move 7 from 7 to 1
+move 1 from 1 to 4
+move 1 from 9 to 8
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+move 1 from 4 to 7
+move 2 from 9 to 4
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+move 1 from 3 to 5
+move 2 from 9 to 8
+move 11 from 8 to 7
+move 2 from 6 to 5
+move 1 from 6 to 9
+move 1 from 1 to 9
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+move 4 from 1 to 4
+move 2 from 1 to 8
+move 1 from 1 to 2
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+move 2 from 2 to 7
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+move 5 from 1 to 4
+move 1 from 2 to 9
+move 1 from 1 to 3
+move 7 from 5 to 8
+move 1 from 3 to 6
+move 8 from 7 to 3
+move 7 from 4 to 8
+move 3 from 8 to 5
+move 1 from 4 to 1
+move 1 from 9 to 4
+move 1 from 4 to 9
+move 1 from 5 to 2
+move 2 from 5 to 6
+move 2 from 8 to 2
+move 7 from 8 to 1
+move 1 from 1 to 7
+move 3 from 6 to 9
+move 2 from 3 to 2
+move 1 from 2 to 1
+move 1 from 8 to 7
+move 2 from 9 to 6
+move 2 from 9 to 5
+move 1 from 5 to 6
+move 1 from 2 to 8
+move 2 from 1 to 7
+move 1 from 4 to 3
+move 3 from 2 to 5
+move 7 from 1 to 3
+move 10 from 3 to 4
+move 3 from 5 to 4
+move 1 from 3 to 8
+move 3 from 3 to 2
+move 1 from 8 to 1
+move 1 from 1 to 3
+move 3 from 8 to 3
+move 5 from 4 to 6
+move 1 from 2 to 3
+move 4 from 6 to 4
+move 1 from 5 to 7
+move 4 from 3 to 4
+move 1 from 2 to 8
+move 12 from 7 to 6
+move 1 from 8 to 2
+move 2 from 2 to 7
+move 1 from 8 to 4
+move 23 from 6 to 3
+move 14 from 3 to 6
+move 15 from 4 to 6
+move 1 from 8 to 6
+move 10 from 3 to 7
+move 2 from 4 to 2
+move 11 from 7 to 8
+move 2 from 2 to 6
+move 44 from 6 to 9
+move 21 from 9 to 3
+move 12 from 3 to 6
+move 1 from 7 to 4
+move 1 from 4 to 7
+move 9 from 3 to 2
+move 2 from 8 to 6
+move 3 from 2 to 4
+move 17 from 9 to 1
+move 3 from 4 to 6
+move 2 from 2 to 9
+move 4 from 9 to 2
+move 10 from 6 to 9
+move 1 from 7 to 6
+move 4 from 9 to 5
+move 4 from 2 to 4
+move 14 from 1 to 5
+move 4 from 4 to 3
+move 3 from 2 to 9
+move 9 from 9 to 7
+move 1 from 2 to 5
+move 9 from 8 to 5
+move 8 from 7 to 2
+move 4 from 3 to 8
+move 5 from 6 to 2
+move 3 from 1 to 6
+move 1 from 7 to 1
+move 4 from 2 to 4
+move 3 from 6 to 4
+move 3 from 8 to 3
+move 13 from 5 to 2
+move 2 from 3 to 5
+move 12 from 5 to 9
+move 1 from 3 to 5
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+move 1 from 8 to 3
+move 4 from 9 to 5
+move 6 from 4 to 5
+move 12 from 9 to 7
+move 1 from 9 to 3
+move 1 from 3 to 2
+move 12 from 5 to 6
+move 12 from 7 to 2
+move 1 from 3 to 7
+move 1 from 4 to 8
+move 33 from 2 to 8
+move 1 from 7 to 5
+move 1 from 1 to 2
+move 4 from 5 to 4
+move 3 from 2 to 5
+move 34 from 8 to 6
+move 1 from 4 to 3
+move 1 from 5 to 7
+move 1 from 7 to 5
+move 3 from 4 to 9
+move 2 from 9 to 7
+move 1 from 9 to 4
+move 1 from 3 to 7
+move 1 from 5 to 8
+move 1 from 5 to 1
+move 1 from 5 to 7
+move 1 from 4 to 8
+move 1 from 1 to 4
+move 1 from 4 to 2
+move 3 from 7 to 5
+move 2 from 8 to 5
+move 1 from 2 to 8
+move 4 from 6 to 2
+move 1 from 8 to 6
+move 1 from 7 to 9
+move 29 from 6 to 7
+move 4 from 2 to 3
+move 2 from 5 to 8
+move 1 from 9 to 5
+move 2 from 8 to 1
+move 23 from 7 to 5
+move 2 from 6 to 1
+move 23 from 5 to 6
+move 1 from 3 to 6
+move 4 from 5 to 9
+move 2 from 1 to 3
+move 5 from 3 to 8
+move 2 from 6 to 5
+move 2 from 1 to 4
+move 1 from 9 to 8
+move 1 from 9 to 1
+move 1 from 4 to 6
+move 2 from 5 to 6
+move 6 from 7 to 8
+move 2 from 9 to 2
+move 18 from 6 to 5
+move 21 from 6 to 4
+move 1 from 1 to 6
+move 2 from 6 to 7
+move 2 from 7 to 9
+move 2 from 2 to 8
+move 7 from 4 to 3
+move 12 from 5 to 3
+move 1 from 9 to 5
+move 1 from 9 to 4
+move 6 from 5 to 2
+move 17 from 3 to 4
+move 3 from 4 to 3
+move 1 from 2 to 4
+move 5 from 2 to 8
+move 1 from 5 to 8
+move 19 from 8 to 7
+move 1 from 3 to 6
+move 1 from 8 to 4
+move 1 from 6 to 1
+move 15 from 4 to 6
+move 1 from 1 to 4
+move 3 from 3 to 5
+move 4 from 6 to 7
+move 1 from 4 to 7
+move 10 from 6 to 7
+move 16 from 4 to 5
+move 24 from 7 to 2
+move 8 from 7 to 8
+move 1 from 4 to 2
+move 6 from 8 to 7
+move 1 from 8 to 7
+move 1 from 6 to 9
+move 14 from 5 to 4
+move 9 from 7 to 8
+move 4 from 5 to 1
+move 2 from 1 to 5
+move 3 from 8 to 6
+move 2 from 6 to 9
+move 2 from 2 to 8
+move 6 from 2 to 7
+move 3 from 4 to 6
+move 1 from 3 to 4
+move 3 from 5 to 7
+move 1 from 6 to 9
+move 5 from 7 to 2
+move 4 from 9 to 1
+move 1 from 7 to 9
+move 9 from 8 to 4
+move 5 from 1 to 2
+move 2 from 6 to 1
+move 6 from 4 to 7
+move 1 from 7 to 3
+move 1 from 3 to 9
+move 1 from 9 to 7
+move 1 from 6 to 7
+move 9 from 4 to 5
+move 7 from 7 to 9
+move 3 from 7 to 5
+move 1 from 9 to 2
+move 6 from 9 to 8
+move 4 from 4 to 5
+move 1 from 4 to 2
+move 1 from 4 to 2
+move 2 from 1 to 2
+move 1 from 9 to 8
+move 10 from 2 to 4
+move 8 from 2 to 7
+move 12 from 2 to 9
+move 6 from 7 to 4
+move 1 from 1 to 2
+move 8 from 9 to 8
+move 7 from 5 to 1
+move 9 from 4 to 3
+move 14 from 8 to 4
+move 1 from 8 to 4
+move 1 from 1 to 5
+move 1 from 5 to 2
+move 3 from 2 to 4
+move 1 from 7 to 1
+move 1 from 7 to 3
+move 2 from 1 to 7
+move 3 from 5 to 7
+move 2 from 7 to 6
+move 1 from 6 to 5
+move 3 from 7 to 1
+move 1 from 6 to 8
+move 1 from 8 to 7
+move 1 from 3 to 6
+move 1 from 7 to 1
+move 4 from 1 to 4
+move 6 from 3 to 2
+move 3 from 1 to 2
+move 3 from 3 to 6
+move 3 from 2 to 6
+move 6 from 6 to 5
+move 1 from 1 to 4
+move 1 from 9 to 6
+move 5 from 2 to 1
+move 3 from 1 to 2
+move 2 from 9 to 8
+move 3 from 1 to 5
+move 1 from 9 to 7
+move 25 from 4 to 1
+move 1 from 1 to 7
+move 2 from 8 to 3
+move 13 from 1 to 9
+move 2 from 3 to 5
+move 8 from 5 to 9
+move 4 from 2 to 1
+move 2 from 6 to 7
+move 10 from 5 to 9
+move 4 from 7 to 2
+move 2 from 2 to 3
+move 9 from 9 to 2
+move 4 from 4 to 5
+move 4 from 5 to 4
+move 5 from 1 to 4
+move 10 from 4 to 5
+move 22 from 9 to 1
+move 2 from 2 to 7
+move 3 from 2 to 1
+move 6 from 2 to 6
+move 1 from 7 to 1
+move 10 from 5 to 7
+move 15 from 1 to 4
+move 13 from 1 to 5
+move 3 from 6 to 8
+move 1 from 8 to 9

2022/inputs/06.txt

@@ -0,0 +1 @@
+grvrnvrnnjljbjqjpqjjvhhzwwrbwwbblrltrrpbbbbqnnqbbbbsvbvmbvmbbrsrqrzrllwbbbqzqrqnqrnrjnnjccdggwqqhrrjcjmjmllgrlglhlclmlvlvsshwwsggmfmdfddgdfftrrczrcczhzppgdgrdggghmmdwwqgggslglfgfcgccmjcjwjrwjrjcrjjsgjjvddpwpgpbbgwbgwwhnhfftbffhpfphhfqfrqfrfnfpprvrsrhrfrllfhhrsrhssvfsvsnvsnsswtwtlthllrjjwddtggzczgcchwcwppfbbdvdrdzrdrvrwwsbsfbssqfsfjsjcscttlztllgjjlbbdsdtssvvvwlvlqqnhqqtdqtddjcdcjjpbphhgtgtqtzqqzhqqtgtvtmvtvrvqrvvfmfmppzzbwwnddzttfpfrrlddbppfqppnwnswwdhwdwjjqljqqthtnhnddgmgcmgcmgcmmfmfttrzzfdzztllmjlllgcgbbcqcvccpnndbdjbjmmzbztzptzpprpddptpprhhvlvmlmpmmljjnnjsjfjjvgjjvzzfgfzfbftbftttgstgstgtpggflfcfqqtctltgltldlzdlzzmmlddnvddzfddppmnpptzptpvttwstwswvwrvvbfbjjjbmjjdvdvrvdddrwrhrzrqqhghhrwhwhrrmppsgpsgszzdfdfwwmtwtvwvgvffmqqqtqntqnnjcncbnbwnnzggrdrqqjbqjjwjqqqwlqwlwzlljhhfsfsqsrqqhwqqwbbqbvvlflrrlglbbjhhjmhjjcmcjcgczcfcgcqqczcnnvjnnlddmpmcppgvgjgddvrrnsnmnqmqgmmnppwgwcgwgssbddgtdgdgmdgmgvvmjmvmjmvvsfssdgdghdggbfbqbdbjbsbmmrpmrprggbllwrwpwtppzvppzsssdnsdnnvnhvvvzvfzfqqnnmlnltldtdvdbdblddsmmlccmlmvlmvmmcsctctrtsrstsbsrshsddlmddmppgsscttnrtrqqcvcwwlnlznnnvcnvvtnvnbnmbmvmppjgjdjtddmpdmdvvmgvvdqdlqlhhzccsggjdjsdsttctjctjtfjttppdzpzzbjbwwmwbblslzslzszlzrrcbrrfggvcczjjtbbdnnggbwblwlbwlwqqfvfqfddrrfccvlllhmhhhrthrthrrnbnzbbpzplphprrrnbbghhnshnhbblqqqvwwffnmnmhhtccpqpvqvbvnvvfnfsnffdjdllwffcddgcgrgjrggchcpcddtbbdtdmtdmmhhtphtpppclcpcvcjvcjjfqfzqqphpnhnrnhhpdhhtfhhbbmqmfmsmvssgqqfssqgglnnqmnmbnmbbllrdrgdrdvrdvdsvvnddgtgddcdqdsqdqbqqlhhwdhdgdcgcdchchrchhpvvpgvgrrfggwfwgmpddbhfngtrwswfszgsggnpsntjpslrpjqsffzrlnbnzdtqpqtjzwlhhgrsrbvnccnsjmzcbqgcbtbqlzhnpnhhrrvqwjwzzvrlcrmjhcscrqhpqmfzbnvcwwqhcjjlnggmpbwztzfswmsbjshnsgfmdlzvzczhrdwgwbghszpnbfpctrshbfhspsczcqcrrqcpwwpfzhjqtpqgjbztrpzrlgfdjbmlwdvlvnfmdzbwsbbhlbszvwcpztlchjrqbmsftltmqpfgdpmdgjvwqqtjsqlfqrwmsnlqgsbqfwsdnfvzthmbplvszfcmlptlcjpnfpjsphsmmjplwjqphgvzbtbjtpttqhlwtgnrjvmvsfsztmsqszzlhqqhfslsvhzgtsssfctzgsqbgdzlpwbsmpcnjqshhhcwqdsdzdhnjfqzqnqdlrpddcgrgldgqbjmdtwgppdczzrjvmcfqjbpjzbtjmgdphlbwnsnpfdqlhwvvmpwzsrztnwvtlbphljmjwsgbphgmwhdmfhpvsmvsjccjhfvqtvfmmlnggncltvtrgmbtfqsvfnlvcmjnjwzcrpjnsgntvhjbtdlptshbhhchqmsprhqzdnfpjqccdfvnzjtlbsmmwvzlwlvmsbrnhqctvtvbfhntdctjnrbcrrlmsnwbbjbcbbgrrhfqwzwwfgvsvgbwnttghtgpspzwzfhffsqjvwwttntnvlwftsfvtttgnprzrzsghvjrdtsfdvzswhmrfcdqsgvrlhzbnvbmjlqrftnnbtwqtvlvwznfbslhdqjbntdgpprfqchjvgvzjssdztjlzwfljjmfvzrbbtczggzqwrnqqgzzcbqjcpfqfrbwtdjrrvbszsjdjcpdfjscsvnltcgwvqsgnhbfgnfnddnpmbzbptrmvqzpvbdpfdvtlmgnnjwflgdbfnmvsdnmlvgcpwflwvdbtbfwtfpsmqsplnzwlwgvbjrhghwrnrswsggbqpdjcjrgbgnsqdvwzzwftvjqgjzzcdvpbbjzpphmbcqmrjvgqwfgrsnqvhwflmhgrlvbpwdcsrlqwfrwppqbrdhwqtvczpclpsbsjcptgblbbsqmbhjjgzwvlcnhnzcttmpjsgchmppgphqlzlcsqcgbbjgtjjvmttdztfdptzgvmpnqrcmpmcdlpnbztllvqbggqbqhlqvdwsrwzsjwfrqvcbvsgfdptmrzpvdfblmhlzrvpmsljlqqzrhlnmwncpfhvqlsbtrjbfcrnfvjvddrhdbbczjdsrdvzlbqrccssdzcpmdsqbprjppfzdwfdswptgzcmjqfhcwsqfqhvrslffqfbcvhdzljzrmtwmfdwzdhhjcmbjtvjhzzwfqhrcslztdbnlwmmhbbbgdscjcdzftnchqfnflnsdqjscfrqpnfbftpzvtmrwncqfqqflschpfnjsjlqcjdjgtwpqhgcnjdmnnvmmpwdspmnrgqrptqwcvbtdwpqlbtwpqgwgfrzlrhtvrvzhmhmwhfdsrhpcczqfltsgtgrfwcvlcvtlhqqwnrqgzpnzbfmzbdwqwbsfvbshrgzqdbgvrhzhzlbqsfzttmsnmrqmwgtzbvdqdrbgcpclzjrhdbjtpcdbbznjgtbwbqrnpvffdmwtrbhhstcmnjcwbbnmpbvmjprtzgcptmtrffwhvfgdljnrbbrblbfbgdwtjrtgqgrpvpgjqrjzczvvlspgdbzftqgqvgdqlglbgvgjdcztznszcwfqhmwbrbjcfstzdcmdsssqfhtzpdgmzjscvbdzgbhhgdqgvfwrzmhdrhlsvlzjjzbzdljcbhncppwrtptjgszlqsrqpzqcsgvdvzmgvwgsncnbffttslphcstqvfwbwzbflmshcbnhpljgqwmmwwzlgpbcqnrtqlwcjcrclfdrnnmvtbfdztdfvtqrsgdptfcfpzpsldhzmrngggfvdqggtlfqqwsldprcffsstnnpmsbbvghdbpprqbssnprdbqclzqtgsrczwcvqwrrfmmfwsndvtvqljwwglrgbphdvvwgctbbmtrbpzqtspgrlhmnhjcdwhwvssgspzjbcfjttjqbdpdmptfzzjcfqljpqddfssmffqprvbptfvdshsdmfmdtmlbnmbmjjjsgmlmwmgcwhbrbgchrstptvdlqgddfzddlzhwjmsvvcjwvqtzjtsctfmzchlbrvlgdzbvdlbfpvhptpltrdmcgjghcpwvwqqnrzdtnmgdncplhdpsgpnbprbgshffwwsdhpgqsbmwdtpnhhltlcqfrjtswcchzvlhdgrmjwhgwppdjqlgmdhwbllqvzrchgclmqdlghjsvmwlflmhhmdzbfjhjnvwphnjbclmdpgflqgtfsmsjslntfcmtbphnrgpdcqtjzjttdtgjmvhzsrfnrjqssvwpcslpfstbpfsrsntmftmdgsqrrsnddqfmchrhtlhmqndvvllnvltdzfphjqnvmcdsgfpcmjftgdpntjzplqljhtthvnbzbzwvfnqsjvnfwhmtbsspjslgfjvdgfjpwrsgqwntntjcqtdgnhnsfwhhqfwbwhdrftj

2022/src/common.rs

@@ -1,6 +1,7 @@
 //! Common helper utilities to all days
 
 use anyhow::Result;
+use nom::combinator::map;
 use nom::error::ErrorKind;
 use nom::error::ParseError;
 use nom::Finish;
@@ -92,3 +93,26 @@ where
         }
     }
 }
+
+/// Add an index to repeated successful invocations of the embedded parser.
+pub fn enumerate<I, O, E>(f: impl Parser<I, O, E>) -> impl FnMut(I) -> IResult<I, (usize, O), E> {
+    let mut index = 0usize;
+
+    map(f, move |v| {
+        let res = (index, v);
+        index += 1;
+        res
+    })
+}
+
+/// Return the minimum and maximum of two unordered variables
+pub fn minmax<T>(a: T, b: T) -> (T, T)
+where
+    T: PartialOrd,
+{
+    if a < b {
+        (a, b)
+    } else {
+        (b, a)
+    }
+}

2022/src/day01.rs

@@ -2,7 +2,6 @@ use std::ops::Add;
 
 use anyhow::Result;
 use nom::character::complete::newline;
-use nom::combinator::opt;
 use nom::multi::separated_list0;
 use nom::sequence::terminated;
 use nom::IResult;
@@ -14,13 +13,9 @@ fn parse_elf(input: &[u8]) -> IResult<&[u8], i32> {
     reduce_many1(terminated(nom::character::complete::i32, newline), Add::add)(input)
 }
 
-fn parse_max(input: &[u8]) -> IResult<&[u8], i32> {
-    reduce_many1(terminated(parse_elf, opt(newline)), Ord::max)(input)
-}
-
 pub fn part1(input: &[u8]) -> Result<String> {
-    let result = parse_input(input, parse_max)?.to_string();
-    Ok(result)
+    let elves = parse_input(input, parse_elf_list)?;
+    Ok(elves.into_iter().fold(0, Ord::max).to_string())
 }
 
 fn parse_elf_list(input: &[u8]) -> IResult<&[u8], Vec<i32>> {

2022/src/day03.rs

@@ -1,9 +1,79 @@
 use anyhow::Result;
+use itertools::Itertools;
 
-pub fn part1(_input: &[u8]) -> Result<String> {
-    todo!()
+fn priority(item: u8) -> u32 {
+    match item {
+        b'a'..=b'z' => item - b'a' + 1,
+        b'A'..=b'Z' => item - b'A' + 27,
+        _ => 0,
+    }
+    .into()
 }
 
-pub fn part2(_input: &[u8]) -> Result<String> {
-    todo!()
+fn seen(backpack: &[u8]) -> u64 {
+    let mut seen = 0;
+
+    for &b in backpack {
+        seen |= 1 << priority(b);
+    }
+
+    seen
+}
+
+pub fn part1(input: &[u8]) -> Result<String> {
+    let mut total = 0;
+
+    for line in input.split(|&b| b == b'\n') {
+        let (first, last) = line.split_at(line.len() / 2);
+
+        let seen = seen(first);
+
+        for &b in last {
+            let prio = priority(b);
+
+            if (seen & (1 << prio)) != 0 {
+                total += prio;
+                break;
+            }
+        }
+    }
+
+    Ok(total.to_string())
+}
+
+pub fn part2(input: &[u8]) -> Result<String> {
+    let mut total = 0;
+
+    for chunk in &input.split(|&b| b == b'\n').chunks(3) {
+        let mut mask = u64::MAX;
+
+        for backpack in chunk {
+            let seen = seen(backpack);
+            mask &= seen;
+        }
+
+        if mask != 0 {
+            debug_assert_eq!(1, mask.count_ones());
+            total += mask.trailing_zeros();
+        }
+    }
+
+    Ok(total.to_string())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const SAMPLE: &[u8] = include_bytes!("samples/03.txt");
+
+    #[test]
+    fn sample_part1() {
+        assert_eq!(part1(SAMPLE).unwrap(), "157")
+    }
+
+    #[test]
+    fn sample_part2() {
+        assert_eq!(part2(SAMPLE).unwrap(), "70")
+    }
 }

2022/src/day04.rs

@@ -1,9 +1,86 @@
 use anyhow::Result;
+use nom::bytes::complete::tag;
+use nom::character::complete::newline;
+use nom::combinator::map;
+use nom::multi::many0;
+use nom::sequence::separated_pair;
+use nom::sequence::terminated;
+use nom::IResult;
 
-pub fn part1(_input: &[u8]) -> Result<String> {
-    todo!()
+use crate::common::minmax;
+use crate::common::parse_input;
+
+#[derive(Copy, Clone, PartialOrd, PartialEq)]
+struct Assignment(u32, u32);
+
+impl Assignment {
+    fn one_contains(self, other: Self) -> bool {
+        let (first, second) = minmax(self, other);
+
+        if second.0 == first.0 {
+            first.1 <= second.1
+        } else {
+            second.0 <= first.1 && second.1 <= first.1
+        }
+    }
+
+    fn one_overlaps(self, other: Self) -> bool {
+        let (first, second) = minmax(self, other);
+
+        if second.0 == first.0 {
+            first.1 <= second.1
+        } else {
+            second.0 <= first.1
+        }
+    }
 }
 
-pub fn part2(_input: &[u8]) -> Result<String> {
-    todo!()
+fn parse_assignments(input: &[u8]) -> IResult<&[u8], Vec<(Assignment, Assignment)>> {
+    use nom::character::complete::u32;
+
+    fn parse_single(input: &[u8]) -> IResult<&[u8], Assignment> {
+        map(separated_pair(u32, tag("-"), u32), |(start, end)| {
+            Assignment(start, end)
+        })(input)
+    }
+
+    let parse_line = separated_pair(parse_single, tag(","), parse_single);
+
+    many0(terminated(parse_line, newline))(input)
+}
+
+fn parts_common(input: &[u8], filter: impl Fn(Assignment, Assignment) -> bool) -> Result<String> {
+    let assigments = parse_input(input, parse_assignments)?;
+
+    let overlapping = assigments
+        .into_iter()
+        .filter(|&(a, b)| filter(a, b))
+        .count();
+
+    Ok(overlapping.to_string())
+}
+
+pub fn part1(input: &[u8]) -> Result<String> {
+    parts_common(input, Assignment::one_contains)
+}
+
+pub fn part2(input: &[u8]) -> Result<String> {
+    parts_common(input, Assignment::one_overlaps)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const SAMPLE: &[u8] = include_bytes!("samples/04.txt");
+
+    #[test]
+    fn sample_part1() {
+        assert_eq!(part1(SAMPLE).unwrap(), "2")
+    }
+
+    #[test]
+    fn sample_part2() {
+        assert_eq!(part2(SAMPLE).unwrap(), "4")
+    }
 }

2022/src/day05.rs

@@ -1,9 +1,166 @@
+use std::cmp::Ordering;
+
 use anyhow::Result;
+use nom::branch::alt;
+use nom::bytes::complete::tag;
+use nom::bytes::complete::take;
+use nom::bytes::complete::take_until;
+use nom::character::complete::newline;
+use nom::combinator::map;
+use nom::combinator::opt;
+use nom::multi::fold_many1;
+use nom::multi::many1;
+use nom::sequence::delimited;
+use nom::sequence::preceded;
+use nom::sequence::terminated;
+use nom::sequence::tuple;
+use nom::IResult;
 
-pub fn part1(_input: &[u8]) -> Result<String> {
-    todo!()
+use crate::common::enumerate;
+use crate::common::parse_input;
+
+type Move = (usize, usize, usize);
+type OwnedStacks = Vec<Vec<u8>>;
+
+fn parse_row<'a>(input: &'a [u8], stacks: &mut OwnedStacks) -> IResult<&'a [u8], ()> {
+    // Forgive me for this crime
+    fold_many1(
+        enumerate(terminated(
+            alt((
+                // Parse a delimited value into a Some(content)
+                map(delimited(tag("["), take(1usize), tag("]")), |v: &[u8]| {
+                    Some(v[0])
+                }),
+                // Or an empty stack into a None
+                map(tag("   "), |_| None),
+            )),
+            opt(tag(" ")),
+        )),
+        || (),
+        move |_, (index, c)| {
+            if let Some(b) = c {
+                if stacks.len() <= index {
+                    stacks.resize_with(index + 1, Vec::new);
+                }
+
+                stacks[index].push(b)
+            }
+        },
+    )(input)
 }
 
-pub fn part2(_input: &[u8]) -> Result<String> {
-    todo!()
+fn parse_stacks(input: &[u8]) -> IResult<&[u8], OwnedStacks> {
+    let mut stacks = Vec::new();
+
+    let (input, _) = terminated(
+        fold_many1(
+            terminated(|input| parse_row(input, &mut stacks), newline),
+            || (),
+            |_, _| (),
+        ),
+        // Skip the line with the numbers
+        take_until("\n\n"),
+    )(input)?;
+
+    // Reverse the stacks since we parsed them top-down
+    for stack in &mut stacks {
+        stack.reverse();
+    }
+
+    Ok((input, stacks))
+}
+
+fn parse_task(input: &[u8]) -> IResult<&[u8], (OwnedStacks, Vec<Move>)> {
+    fn parse_usize(input: &[u8]) -> IResult<&[u8], usize> {
+        map(nom::character::complete::u32, |v| v as usize)(input)
+    }
+    let (input, stacks) = parse_stacks(input)?;
+
+    // Consume the double newline
+    let (input, _) = tag("\n\n")(input)?;
+
+    let (input, moves) = many1(terminated(
+        tuple((
+            preceded(tag("move "), parse_usize),
+            preceded(tag(" from "), parse_usize),
+            preceded(tag(" to "), parse_usize),
+        )),
+        newline,
+    ))(input)?;
+
+    Ok((input, (stacks, moves)))
+}
+
+/// Some magic to get two mutable references into the same slice
+fn get_both(stacks: &mut [Vec<u8>], from: usize, to: usize) -> (&mut Vec<u8>, &mut Vec<u8>) {
+    match from.cmp(&to) {
+        Ordering::Greater => {
+            let (begin, end) = stacks.split_at_mut(from);
+            (&mut end[0], &mut begin[to])
+        }
+        Ordering::Less => {
+            let (begin, end) = stacks.split_at_mut(to);
+            (&mut begin[from], &mut end[0])
+        }
+        Ordering::Equal => panic!("Tried to stack from and to {from}"),
+    }
+}
+
+fn compute_answer(stacks: &mut [Vec<u8>]) -> Result<String> {
+    let mut result = String::with_capacity(stacks.len());
+
+    for stack in stacks {
+        result.push(
+            *stack
+                .last()
+                .ok_or_else(|| anyhow::anyhow!("Encountered empty stack"))? as char,
+        );
+    }
+
+    Ok(result)
+}
+
+pub fn part1(input: &[u8]) -> Result<String> {
+    let (mut stacks, moves) = parse_input(input, parse_task)?;
+
+    for (count, from, to) in moves {
+        let (from, to) = get_both(&mut stacks, from - 1, to - 1);
+
+        let drain_start = from.len() - count;
+
+        to.extend(from.drain(drain_start..).rev());
+    }
+
+    compute_answer(&mut stacks)
+}
+
+pub fn part2(input: &[u8]) -> Result<String> {
+    let (mut stacks, moves) = parse_input(input, parse_task)?;
+
+    for (count, from, to) in moves {
+        let (from, to) = get_both(&mut stacks, from - 1, to - 1);
+
+        let drain_start = from.len() - count;
+
+        to.extend(from.drain(drain_start..));
+    }
+
+    compute_answer(&mut stacks)
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const SAMPLE: &[u8] = include_bytes!("samples/05.txt");
+
+    #[test]
+    fn sample_part1() {
+        assert_eq!(part1(SAMPLE).unwrap(), "CMZ");
+    }
+
+    #[test]
+    fn sample_part2() {
+        assert_eq!(part2(SAMPLE).unwrap(), "MCD");
+    }
 }

2022/src/day06.rs

@@ -1,9 +1,68 @@
 use anyhow::Result;
 
-pub fn part1(_input: &[u8]) -> Result<String> {
-    todo!()
+fn find_first(input: &[u8], unique: usize) -> Result<usize> {
+    let mut seen = [false; 256];
+
+    let mut tail_it = input.iter();
+
+    let mut first = 0;
+
+    // Loop invariant: input[first..last] contains only unique characters
+    for (last, &c) in input.iter().enumerate() {
+        if seen[c as usize] {
+            first += (&mut tail_it)
+                .take_while(|&&b| b != c)
+                .map(|&b| seen[b as usize] = false)
+                .count()
+                + 1; // +1 because take_while doesn't return the first element that didn't satisfy the condition, while we do need to count it
+        } else {
+            // New unique character found: input[first..=last] contains unique characters
+            if last - first + 1 == unique {
+                return Ok(last + 1);
+            }
+
+            seen[c as usize] = true;
+        }
+    }
+
+    anyhow::bail!("Did not find unique sequence of length {unique}");
 }
 
-pub fn part2(_input: &[u8]) -> Result<String> {
-    todo!()
+pub fn part1(input: &[u8]) -> Result<String> {
+    Ok(find_first(input, 4)?.to_string())
+}
+
+pub fn part2(input: &[u8]) -> Result<String> {
+    Ok(find_first(input, 14)?.to_string())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    const SAMPLES: &[&[u8]] = &[
+        b"mjqjpqmgbljsphdztnvjfqwrcgsmlb",
+        b"bvwbjplbgvbhsrlpgdmjqwftvncz",
+        b"nppdvjthqldpwncqszvftbrmjlhg",
+        b"nznrnfrfntjfmvfwmzdfjlvtqnbhcprsg",
+        b"zcfzfwzzqfrljwzlrfnpqdbhtmscgvjw",
+    ];
+
+    #[test]
+    fn sample_part1() {
+        const CORRECT: &[usize] = &[7, 5, 6, 10, 11];
+
+        for (&sample, &correct) in SAMPLES.iter().zip(CORRECT) {
+            assert_eq!(find_first(sample, 4).unwrap(), correct);
+        }
+    }
+
+    #[test]
+    fn sample_part2() {
+        const CORRECT: &[usize] = &[19, 23, 23, 29, 26];
+
+        for (&sample, &correct) in SAMPLES.iter().zip(CORRECT) {
+            assert_eq!(find_first(sample, 14).unwrap(), correct);
+        }
+    }
 }

2022/src/samples/03.txt

@@ -0,0 +1,6 @@
+vJrwpWtwJgWrhcsFMMfFFhFp
+jqHRNqRjqzjGDLGLrsFMfFZSrLrFZsSL
+PmmdzqPrVvPwwTWBwg
+wMqvLMZHhHMvwLHjbvcjnnSBnvTQFn
+ttgJtRGJQctTZtZT
+CrZsJsPPZsGzwwsLwLmpwMDw

2022/src/samples/04.txt

@@ -0,0 +1,6 @@
+2-4,6-8
+2-3,4-5
+5-7,7-9
+2-8,3-7
+6-6,4-6
+2-6,4-8

2022/src/samples/05.txt

@@ -0,0 +1,9 @@
+    [D]    
+[N] [C]    
+[Z] [M] [P]
+ 1   2   3 
+
+move 1 from 2 to 1
+move 3 from 1 to 3
+move 2 from 2 to 1
+move 1 from 1 to 2