Day 5 initial solution (part 2 too slow, untested)

input/2023/day5.txt

@@ -0,0 +1,213 @@
+seeds: 3139431799 50198205 3647185634 110151761 2478641666 139825503 498892555 8913570 961540761 489996751 568452082 100080382 907727477 42158689 1617552130 312026427 342640189 97088268 2049289560 336766062
+
+seed-to-soil map:
+1615836342 1401909974 23067952
+785532007 269485885 88937774
+3019002892 2773729385 10470414
+4202163101 2747292152 26437233
+3183210415 4217634159 77333137
+2847460091 3211730218 136699600
+2455891790 3791729773 70553041
+3260543552 2581343101 165949051
+3840286095 2849853212 361877006
+4228600334 2361239030 66366962
+1594559581 1077839137 21276761
+380069408 165017790 44262617
+3598718222 1894384162 241567873
+0 1424977926 190757551
+1894384162 2810496375 39356837
+424332025 606264721 196539291
+3521487829 2221977524 77230393
+742681934 69797365 36566707
+1638904294 1615735477 139190145
+1335949488 0 69797365
+779248641 802804012 6283366
+2638766896 4008940964 208693195
+250963029 1142644585 70452661
+1933740999 3470280789 321448984
+190757551 209280407 60205478
+1778094439 1099115898 43528687
+2255189983 3348429818 121850971
+1000500225 809087378 268751759
+1269251984 1754925622 66697504
+874469781 358423659 126030444
+2526444831 2135952035 86025489
+2439072067 3992121241 16819723
+3426492603 3897126015 94995226
+1405746853 1213097246 188812728
+321415690 106364072 58653718
+2984159691 3862282814 34843201
+2377040954 2299207917 62031113
+3029473306 2427605992 153737109
+2612470320 2784199799 26296576
+620871316 484454103 121810618
+
+soil-to-fertilizer map:
+4245401761 2352458099 28057201
+2099789767 3998256334 14950546
+3446056574 2749719529 135349925
+890092371 1379309857 42097049
+953714890 896502554 10335567
+3115342240 2380515300 218129381
+3333471621 3885671381 112584953
+663999152 0 226093219
+1873325002 727305635 169196919
+2042521921 1328150912 51158945
+3581406499 4034715214 260252082
+500989478 564295961 163009674
+4273458962 4013206880 21508334
+3992733429 2099789767 164092891
+4156826320 2263882658 88575441
+3841658581 2598644681 151074848
+1094703999 226093219 21270249
+1708571521 399542480 164753481
+964050457 247363468 130653542
+1236290130 1421406906 171284482
+0 1592691388 500989478
+932189420 378017010 21525470
+2114740313 2885069454 1000601927
+1115974248 1207835030 120315882
+1407574612 906838121 300996909
+
+fertilizer-to-water map:
+3217858280 3761663130 355893932
+2319366035 2401839275 72374872
+1962726423 909927230 105011330
+2115307878 441322644 204058157
+2095064202 1824085445 20243676
+110580631 329763915 34129824
+2573484127 2701101998 225220022
+1780224111 2342656863 59182412
+1717605398 1571533532 62618713
+3589165621 3062909078 75538793
+842280446 1871096488 471560375
+409726333 0 243114563
+397401582 760576019 12324751
+0 667815878 92760141
+3990305711 2926322020 5981819
+251664023 1741105813 32320840
+2072629125 645380801 22435077
+92760141 363893739 17820490
+2798704149 3138447871 156185660
+3664704414 2573484127 127617871
+1839406523 381714229 59608415
+283984863 1844329121 26767367
+1313840821 1176023584 27579684
+2391740907 1790738543 33346902
+3929650615 4234312200 60655096
+3996287530 3557602002 204061128
+1402088224 772900770 137026460
+1911435456 2474214147 51290967
+1539114684 1393042818 178490714
+3573752212 4117557062 15413409
+1341420505 1014938560 60667719
+3792322285 4132970471 6723091
+4200348658 4139693562 80082634
+652840896 1203603268 189439550
+310752230 243114563 86649352
+2425087809 1075606279 100417305
+1899014938 1773426653 12420518
+2067737753 1785847171 4891372
+3799045376 2932303839 130605239
+2954889809 3294633531 262968471
+4280431292 4219776196 14536004
+144710455 1634152245 106953568
+
+water-to-light map:
+1071107509 759231097 26724064
+1293599454 642189614 64567949
+3147690498 1633749175 71376364
+3487999223 4080968704 155844998
+1700873635 2097781236 292450760
+1146121952 1950303734 147477502
+2864027062 1470573702 75076585
+2507471274 3021419800 175807670
+2939103647 922829268 123372939
+2826742681 2551285626 37284381
+719212681 1821763210 100196810
+4236813702 4292227071 2740225
+3643844221 3837685117 243283587
+209103905 785955161 52302440
+100332146 752700417 6530680
+1478192138 3229160565 10342236
+1358167403 3239502801 94242072
+3219066862 706757563 45942854
+3062476586 1358475140 29661777
+819409491 2390231996 26561329
+4195136152 3511184798 41677550
+1488534374 1046202207 35444248
+3887127808 3552862348 284822769
+2188804057 1705125539 116637671
+0 309410320 100332146
+1117778238 1921960020 28343714
+261406345 3333744873 74978759
+2100705169 1545650287 88098888
+3450098653 3473284228 37900570
+2742067948 1273800407 84674733
+2305441728 107380774 202029546
+3265009716 1130086491 143713916
+1993324395 0 107380774
+1523978622 465294601 176895013
+106862826 2588570007 102241079
+2683278944 864040264 58789004
+4239553927 4236813702 55413369
+1097831573 1081646455 19946665
+524293914 1101593120 28493371
+336385104 2833510990 187908810
+552787285 3197227470 31933095
+845970820 2690811086 142699904
+988670724 1388136917 82436785
+1452409475 838257601 25782663
+3092138363 409742466 55552135
+584720380 2416793325 134492301
+4171950577 3450098653 23185575
+
+light-to-temperature map:
+2906633798 3843376160 451591136
+1332454428 1190958320 69004583
+1837712164 0 353313230
+494809338 353313230 376619264
+871428602 729932494 461025826
+1401459011 1754772241 373416033
+3976747173 3375456648 91164221
+3495346659 3466620869 376755291
+0 1259962903 494809338
+2608238358 2459541635 298395440
+3907558614 2984992977 69188559
+3872101950 2286963246 35456664
+4067911394 2757937075 227055902
+3358224934 2322419910 137121725
+2286963246 3054181536 321275112
+1774875044 2128188274 62837120
+
+temperature-to-humidity map:
+3966168141 3406025946 214996780
+4181164921 3292223571 113802375
+1493139015 1471031672 367564898
+1423475871 1838596570 69663144
+0 479293006 226560784
+2500785470 2859072453 433151118
+3197453551 2500785470 96923792
+758446483 1237739489 233292183
+991738666 0 278789291
+3555740534 3884539689 410427607
+3294377343 2597709262 261363191
+226560784 705853790 531885699
+1860703913 305742584 20602508
+2933936588 3621022726 263516963
+1881306421 278789291 26953293
+1270527957 326345092 152947914
+
+humidity-to-location map:
+848612454 2250862530 61410922
+910023376 3689675651 35197452
+3724873103 3865027106 240221283
+483883727 3324946924 364728727
+0 1766978803 483883727
+1957894300 561533 922927950
+945220828 2590144784 734802140
+2880822250 0 561533
+3447014853 1489120553 277858250
+2881383783 923489483 565631070
+3965094386 3724873103 140154003
+1680022968 2312273452 277871332

src/day05.rs

@@ -0,0 +1,129 @@
+use std::ops::Range;
+
+use aoc_runner_derive::{aoc, aoc_generator};
+use nom::{
+    bytes::complete::tag,
+    character::complete::{anychar, line_ending},
+    combinator::map,
+    multi::{many_till, separated_list0},
+    sequence::{pair, preceded, separated_pair, terminated, tuple},
+    IResult,
+};
+
+#[derive(Debug)]
+struct Map {
+    ranges: Vec<(Range<u32>, i32)>,
+}
+
+impl Map {
+    fn new(raw_ranges: Vec<(u32, u32, u32)>) -> Self {
+        let mut ranges = Vec::new();
+        for (dest_start, source_start, len) in raw_ranges {
+            let source_range = source_start..(source_start + len);
+            let offset = ((dest_start as i64) - (source_start as i64)) as i32;
+            ranges.push((source_range, offset))
+        }
+        Self { ranges }
+    }
+
+    fn transform(&self, input: u32) -> u32 {
+        for (range, offset) in &self.ranges {
+            if range.contains(&input) {
+                return ((input as i64) + (*offset as i64)) as u32;
+            }
+        }
+        input
+    }
+
+    fn transform_range(&self, input: Range<u32>) -> Range<u32> {
+        let start = self.transform(input.start);
+        let end = self.transform(input.end);
+        start..end
+    }
+}
+
+fn parse_seed_list(input: &str) -> IResult<&str, Vec<u32>> {
+    preceded(
+        tag("seeds: "),
+        separated_list0(tag(" "), nom::character::complete::u32),
+    )(input)
+}
+
+fn parse_seed_list_as_ranges(input: &str) -> IResult<&str, Vec<Range<u32>>> {
+    preceded(
+        tag("seeds: "),
+        separated_list0(
+            tag(" "),
+            map(
+                separated_pair(
+                    nom::character::complete::u32,
+                    tag(" "),
+                    nom::character::complete::u32,
+                ),
+                |(start, length)| (start..(start + length)),
+            ),
+        ),
+    )(input)
+}
+
+fn parse_raw_range(input: &str) -> IResult<&str, (u32, u32, u32)> {
+    tuple((
+        terminated(nom::character::complete::u32, tag(" ")),
+        terminated(nom::character::complete::u32, tag(" ")),
+        nom::character::complete::u32,
+    ))(input)
+}
+
+fn parse_map(input: &str) -> IResult<&str, Map> {
+    map(
+        preceded(
+            many_till(anychar, line_ending),
+            separated_list0(line_ending, parse_raw_range),
+        ),
+        Map::new,
+    )(input)
+}
+
+#[aoc_generator(day5, part1)]
+fn input_generator_part1(input: &str) -> (Vec<u32>, Vec<Map>) {
+    pair(
+        terminated(parse_seed_list, pair(line_ending, line_ending)),
+        separated_list0(pair(line_ending, line_ending), parse_map),
+    )(input)
+    .unwrap()
+    .1
+}
+
+#[aoc_generator(day5, part2)]
+fn input_generator_part2(input: &str) -> (Vec<Range<u32>>, Vec<Map>) {
+    pair(
+        terminated(parse_seed_list_as_ranges, pair(line_ending, line_ending)),
+        separated_list0(pair(line_ending, line_ending), parse_map),
+    )(input)
+    .unwrap()
+    .1
+}
+
+#[aoc(day5, part1)]
+fn part1((seeds, maps): &(Vec<u32>, Vec<Map>)) -> u32 {
+    fn run_through_maps(seed: u32, maps: &[Map]) -> u32 {
+        maps.iter().fold(seed, |val, map| map.transform(val))
+    }
+    seeds
+        .iter()
+        .map(|&seed| run_through_maps(seed, &maps))
+        .min()
+        .unwrap()
+}
+
+#[aoc(day5, part2)]
+fn part2((seeds, maps): &(Vec<Range<u32>>, Vec<Map>)) -> u32 {
+    fn run_through_maps(seed: u32, maps: &[Map]) -> u32 {
+        maps.iter().fold(seed, |val, map| map.transform(val))
+    }
+    seeds
+        .iter()
+        .flat_map(|range| maps.iter().fold(range.clone(), |val, map| map.transform_range(val)).clone())
+        .min()
+        .unwrap()
+}

src/lib.rs

@@ -4,5 +4,6 @@ mod day01;
 mod day02;
 mod day03;
 mod day04;
+mod day05;
 
 aoc_lib! { year = 2023 }