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2021: day13: part 1 & 2

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Antoine Martin 2021-12-13 11:58:29 +01:00
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916
aoc2021/input/day13.txt Normal file
View file

@ -0,0 +1,916 @@
1213,736
1158,890
626,303
98,10
878,268
1208,143
112,400
865,894
1218,179
1089,418
535,886
726,515
1263,786
589,270
80,518
288,322
1101,483
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1002,707
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552,591
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912,40
1268,761
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883,574
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719,236
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836,581
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23,466
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432,268
195,493
1001,308
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257,721
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139,751
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709,796
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184,241
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105,333
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252,341
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112,884
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45,75
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654,719
1225,309
1226,892
453,465
783,520
987,446
348,458
976,175
487,392
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356,527
363,774
142,130
246,581
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925,837
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529,877
124,341
709,546
651,490
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537,614
1004,213
1198,661
1240,40
701,504
1103,120
638,462
857,351
269,794
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624,360
1284,217
902,26
102,672
691,208
850,287
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475,539
1280,735
495,712
1273,655
217,854
1109,687
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939,43
902,203
803,241
35,838
169,624
206,236
413,718
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729,786
372,430
467,242
771,324
924,268
574,854
167,502
141,738
166,52
659,336
1240,123
672,462
902,581
883,320
37,655
209,0
897,875
823,630
1074,264
385,794
1131,838
1151,504
1294,357
1260,396
1228,768
209,57
1225,360
1111,710
333,586
996,371
954,140
790,367
843,348
1058,877
252,509
181,385
1218,267
1123,428
191,98
1039,372
214,504
274,260
359,751
1109,753
659,359
10,674
835,56
730,490
378,1
0,539
35,182
276,661
469,626
1061,533
783,432
656,847
281,707
187,428
1275,568
716,143
938,878
663,117
738,254
954,86
467,796
966,761
405,311
209,651
38,98
1233,824
430,837
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865,280
1123,18
985,170
182,859
1164,245
656,607
979,784
634,10
460,829
768,172
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1000,805
1198,830
629,536
208,542
1193,747
328,60
1123,751
1004,10
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254,571
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380,310
616,117
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1165,509
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905,311
162,763
354,889
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10,226
326,847
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1261,143
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310,462
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85,361
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1020,486
16,462
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440,102
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925,794
453,65
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180,656
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460,65
893,271
344,581
609,208
246,432
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185,268
311,696
736,488
346,707
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38,565
420,267
433,18
1101,651
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420,627
1245,446
905,361
954,527
909,450
495,392
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179,429
1230,868
1129,621
932,681
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344,313
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634,557
529,17
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1111,184
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52,36
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28,310
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281,502
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351,98
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80,656
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676,841
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35,470
185,716
1310,57
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391,658
815,182
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868,866
356,140
628,229
841,492
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1195,696
634,287
523,65
345,138
310,49
663,623
474,581
520,639
224,57
1287,428
328,579
323,392
351,504
1287,255
815,360
194,136
207,269
542,436
432,178
110,634
878,716
201,829
897,718
52,726
328,159
1258,502
1307,87
1129,733
979,315
323,427
1002,187
351,639
938,430
527,520
870,176
1069,639
1307,467
36,856
23,31
413,534
402,341
687,65
619,120
634,884
1258,858
18,203
542,885
604,781
1282,758
5,553
1294,385
378,437
1096,56
835,838
23,876
1111,278
1011,33
308,707
117,798
331,763
470,241
830,732
1265,691
982,287
950,709
755,196
691,694
776,12
1290,765
619,40
738,640
1121,88
938,464
951,143
537,208
736,518
405,126
453,543
365,694
157,329
385,57
37,358
482,341
442,28
870,457
984,336
693,239
917,176
45,158
892,264
1258,812
1113,534
303,7
1004,661
569,869
281,158
378,681
569,534
16,509
435,708
373,840
1192,542
721,606
1041,794
1151,392
343,646
684,143
1064,740
552,751
1151,182
1143,616
698,313
1064,812
446,800
564,812
1191,717
452,105
85,360
947,504
380,82
937,483
319,551
922,815
1213,515
984,607
73,556
309,852
50,661
1181,847
1300,535
448,560
291,854
447,8
0,91
1191,625
932,233
371,689
361,131
865,798
1169,738
446,94
966,581
110,309
74,404
1000,49
1,842
798,354
20,884
1233,406
1230,243
492,267
867,248
346,187
1245,472
736,406
656,287
962,590
572,640
544,260
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1029,392
169,278
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420,630
488,52
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3,87
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897,176
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541,191
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678,268
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448,637
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951,751
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626,143
733,809
656,281
0,837
529,429
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378,400
418,364
556,182
969,481
500,61
947,774
761,333
1012,136
1258,530
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666,311
326,558
512,130
870,718
689,682
1104,658
1101,614
187,876
1237,556
313,861
222,716
676,884
201,375
336,28
1058,509
469,492
1081,232
361,763
42,761
1183,462
1148,110
1273,239
905,712
863,438
905,518
736,474
1034,445
1088,716
1022,677
117,224
1265,686
1171,751
862,112
0,165
1123,546
1310,508
49,143
880,837
976,719
684,361
1233,70
28,478
82,126
1053,721
131,625
900,289
1193,278
373,65
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490,617
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413,176
82,96
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469,786
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843,652
1118,815
775,886
624,829
166,500
555,574
385,837
455,278
487,840
65,446
1139,819
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1169,114
1101,894
624,381
227,250
119,269
1029,56
616,98
905,126
937,449
1096,504
1141,624
1099,772
201,687
1116,65
217,40
708,136
787,65
1273,648
1155,338
659,87
201,207
402,161
1091,708
440,722
447,269
1022,572
939,205
497,329
1058,553
542,661
863,886
155,338
622,857
92,715
612,133
962,458
634,159
28,30
288,677
1028,878
1183,520
169,176
23,428
1292,203
754,182
555,320
35,208
701,75
1022,322
684,533
320,623
857,95
18,770
214,50
7,777
398,406
261,176
783,462
709,98
1123,815
440,457
708,168
447,625
359,418
1278,485
1012,143
159,504
38,796
1230,332
418,530
877,255
654,505
28,136
912,406
1193,320
485,46
351,838
1265,75
758,143
1300,226
1282,527
612,761
575,556
979,763
77,70
654,607
688,261
766,585
145,385
363,504
676,287
788,607
857,465
1128,35
574,513
1200,309
10,668
169,553
654,57
1064,868
191,796
45,686
982,159
795,79
413,361
761,863
473,273
0,401
1017,579
840,808
99,434
79,556
162,784
459,418
798,10
195,418
651,404
520,527
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965,565
288,217
730,404
1282,478
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803,315
962,304
820,617
741,534
549,333
862,714
363,326
102,222
348,436
1156,553
1064,463
97,214
609,691
214,722
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372,688
453,519
385,401
622,633
70,40
455,616
949,763
693,599
194,758
512,541
1169,786
617,536
1086,837
112,494
910,161
984,495
959,56
977,586
454,262
1141,341
609,203
748,19
1143,560
656,508
541,703
1181,495
1183,246
542,102
736,189
433,866
661,756
659,490
331,446
236,630
610,688
3,467
446,268
694,117
308,35
537,350
1101,243
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127,432
979,110
802,705
741,86
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1198,233
808,890
1279,12
50,396
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23,255
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448,714
1236,205
1193,798
1103,625
945,694
1139,108
522,287
624,513
997,33
1190,658
35,56
1275,406
773,208
1125,716
69,621
1093,518
1310,837
1125,268
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1102,94
306,10
373,483
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858,105
602,168
624,159
334,719
480,162
870,172
602,736
0,508
1064,154
1056,712
582,161
1261,591
661,308
35,200
92,19
214,390
fold along x=655
fold along y=447
fold along x=327
fold along y=223
fold along x=163
fold along y=111
fold along x=81
fold along y=55
fold along x=40
fold along y=27
fold along y=13
fold along y=6

21
aoc2021/input/day13_provided.txt Normal file
View file

@ -0,0 +1,21 @@
6,10
0,14
9,10
0,3
10,4
4,11
6,0
6,12
4,1
0,13
10,12
3,4
3,0
8,4
1,10
2,14
8,10
9,0
fold along y=7
fold along x=5

210
aoc2021/src/day13.rs Normal file
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@ -0,0 +1,210 @@
use std::collections::HashSet;
use std::fmt::Write;
use anyhow::{anyhow, Context, Result};
const INPUT: &str = include_str!("../input/day13.txt");
pub fn run() -> Result<String> {
let mut res = String::with_capacity(128);
writeln!(res, "part 1: {}", part1(INPUT)?)?;
writeln!(res, "part 2: {}", part2(INPUT)?)?;
Ok(res)
}
fn part1(input: &str) -> Result<usize> {
let (sheet, fold_instructions) = input.split_once("\n\n").context("couldn't split input")?;
let mut sheet: PaperSheet = sheet.parse()?;
let fold_instructions: Vec<FoldInstruction> = fold_instructions
.lines()
.map(|l| l.trim().parse())
.collect::<Result<_>>()?;
sheet.apply(
*fold_instructions
.first()
.context("had 0 fold instructions")?,
);
Ok(sheet.num_points())
}
fn part2(input: &str) -> Result<String> {
let (sheet, fold_instructions) = input.split_once("\n\n").context("couldn't split input")?;
let mut sheet: PaperSheet = sheet.parse()?;
let fold_instructions: Vec<FoldInstruction> = fold_instructions
.lines()
.map(|l| l.trim().parse())
.collect::<Result<_>>()?;
for instr in fold_instructions {
sheet.apply(instr);
}
Ok(format!("{}", sheet))
}
struct PaperSheet {
points: HashSet<(usize, usize)>,
}
impl PaperSheet {
fn apply(&mut self, instr: FoldInstruction) {
let mut to_insert = Vec::new();
let mut to_remove = Vec::new();
for point in &self.points {
match instr {
FoldInstruction::AlongX(x) => {
if point.0 <= x {
continue;
}
let new_point = (x - (point.0 - x), point.1);
to_insert.push(new_point);
to_remove.push(*point);
}
FoldInstruction::AlongY(y) => {
if point.1 <= y {
continue;
}
let new_point = (point.0, y - (point.1 - y));
to_insert.push(new_point);
to_remove.push(*point);
}
}
}
to_remove.iter().for_each(|point| {
self.points.remove(point);
});
to_insert.into_iter().for_each(|point| {
self.points.insert(point);
});
}
fn num_points(&self) -> usize {
self.points.len()
}
}
impl std::fmt::Display for PaperSheet {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
// make sure first row appears on its own line
writeln!(f)?;
if self.points.is_empty() {
return writeln!(f, "`empty paper sheet`");
}
let (width, _) = self.points.iter().max_by_key(|point| point.0).unwrap();
let (_, height) = self.points.iter().max_by_key(|point| point.1).unwrap();
for y in 0..=*height {
for x in 0..=*width {
let chr = if self.points.contains(&(x, y)) {
'#'
} else {
'.'
};
f.write_char(chr)?;
}
writeln!(f)?;
}
Ok(())
}
}
impl std::str::FromStr for PaperSheet {
type Err = anyhow::Error;
fn from_str(s: &str) -> Result<Self> {
let mut points = HashSet::new();
for l in s.lines() {
let (x, y) = l
.trim()
.split_once(',')
.context("couldn't parse paper sheet point coordinate")?;
let (x, y) = (x.parse()?, y.parse()?);
points.insert((x, y));
}
Ok(PaperSheet { points })
}
}
#[derive(Clone, Copy)]
enum FoldInstruction {
AlongX(usize),
AlongY(usize),
}
impl std::str::FromStr for FoldInstruction {
type Err = anyhow::Error;
fn from_str(s: &str) -> Result<Self> {
let (axis, coord) = s
.split_once('=')
.context("couldn't parse folding instruction")?;
let coord = coord.parse()?;
match axis {
"fold along x" => Ok(FoldInstruction::AlongX(coord)),
"fold along y" => Ok(FoldInstruction::AlongY(coord)),
_ => Err(anyhow!("couldn't parse folding instruction")),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
const PROVIDED: &str = include_str!("../input/day13_provided.txt");
#[test]
fn part1_provided() {
assert_eq!(part1(PROVIDED).unwrap(), 17);
}
#[test]
fn part1_real() {
assert_eq!(part1(INPUT).unwrap(), 753);
}
#[test]
fn part2_provided() {
assert_eq!(
part2(PROVIDED).unwrap(),
"
#####
#...#
#...#
#...#
#####
"
);
}
#[test]
fn part2_real() {
assert_eq!(
part2(INPUT).unwrap(),
"
#..#.####.#....####.#..#...##.###..#..#
#..#....#.#....#....#..#....#.#..#.#.#.
####...#..#....###..####....#.#..#.##..
#..#..#...#....#....#..#....#.###..#.#.
#..#.#....#....#....#..#.#..#.#.#..#.#.
#..#.####.####.####.#..#..##..#..#.#..#
"
);
}
}

1
aoc2021/src/lib.rs
View file

@ -11,3 +11,4 @@ pub mod day08;
pub mod day09; pub mod day09;
pub mod day10; pub mod day10;
pub mod day11; pub mod day11;
pub mod day13;

2
aoc2021/src/main.rs
View file

@ -13,6 +13,7 @@ use aoc2021::day08;
use aoc2021::day09; use aoc2021::day09;
use aoc2021::day10; use aoc2021::day10;
use aoc2021::day11; use aoc2021::day11;
use aoc2021::day13;
fn main() -> Result<()> { fn main() -> Result<()> {
let days: &[DayFunc] = &[ let days: &[DayFunc] = &[
@ -27,6 +28,7 @@ fn main() -> Result<()> {
day09::run, day09::run,
day10::run, day10::run,
day11::run, day11::run,
day13::run,
]; ];
aoc::run(days) aoc::run(days)