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+ "wasm-bindgen-shared",
+]
+
+[[package]]
+name = "wasm-bindgen-shared"
+version = "0.2.89"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7ab9b36309365056cd639da3134bf87fa8f3d86008abf99e612384a6eecd459f"
+
+[[package]]
+name = "web-sys"
+version = "0.3.66"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50c24a44ec86bb68fbecd1b3efed7e85ea5621b39b35ef2766b66cd984f8010f"
+dependencies = [
+ "js-sys",
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "winapi"
+version = "0.3.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5c839a674fcd7a98952e593242ea400abe93992746761e38641405d28b00f419"
+dependencies = [
+ "winapi-i686-pc-windows-gnu",
+ "winapi-x86_64-pc-windows-gnu",
+]
+
+[[package]]
+name = "winapi-i686-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ac3b87c63620426dd9b991e5ce0329eff545bccbbb34f3be09ff6fb6ab51b7b6"
+
+[[package]]
+name = "winapi-util"
+version = "0.1.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f29e6f9198ba0d26b4c9f07dbe6f9ed633e1f3d5b8b414090084349e46a52596"
+dependencies = [
+ "winapi",
+]
+
+[[package]]
+name = "winapi-x86_64-pc-windows-gnu"
+version = "0.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
diff --git a/day_05/Cargo.toml b/day_05/Cargo.toml
new file mode 100644
index 0000000..9acf0e3
--- /dev/null
+++ b/day_05/Cargo.toml
@@ -0,0 +1,22 @@
+[package]
+name = "day_05"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+nom = "7.1.3"
+strum = "0.25.0"
+strum_macros = "0.25.3"
+
+[dev-dependencies]
+criterion = { version = "0.4", features = ["html_reports"] }
+
+[[bench]]
+name = "part1"
+harness = false
+
+[[bench]]
+name = "part2"
+harness = false
diff --git a/day_05/benches/part1.rs b/day_05/benches/part1.rs
new file mode 100644
index 0000000..5e2452c
--- /dev/null
+++ b/day_05/benches/part1.rs
@@ -0,0 +1,11 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+use day_05::prelude::*;
+
+fn criterion_benchmark(c: &mut Criterion) {
+    let input = include_str!("../input.txt");
+    c.bench_function("part 1", |b| b.iter(|| part1(black_box(input))));
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);
diff --git a/day_05/benches/part2.rs b/day_05/benches/part2.rs
new file mode 100644
index 0000000..4dd3025
--- /dev/null
+++ b/day_05/benches/part2.rs
@@ -0,0 +1,11 @@
+use criterion::{black_box, criterion_group, criterion_main, Criterion};
+
+use day_05::prelude::*;
+
+fn criterion_benchmark(c: &mut Criterion) {
+    let input = include_str!("../input.txt");
+    c.bench_function("part 2", |b| b.iter(|| part2(black_box(input))));
+}
+
+criterion_group!(benches, criterion_benchmark);
+criterion_main!(benches);
diff --git a/day_05/input.txt b/day_05/input.txt
new file mode 100644
index 0000000..d612f11
--- /dev/null
+++ b/day_05/input.txt
@@ -0,0 +1,249 @@
+seeds: 763445965 78570222 1693788857 146680070 1157620425 535920936 3187993807 180072493 1047354752 20193861 2130924847 274042257 20816377 596708258 950268560 11451287 3503767450 182465951 3760349291 265669041
+
+seed-to-soil map:
+0 1894195346 315486903
+1184603419 2977305241 40929361
+1225532780 597717 4698739
+1988113706 1603988885 78481073
+679195301 529385087 505408118
+1781158512 2285166785 39457705
+352613463 2324624490 326581838
+1820616217 1738931330 104130014
+2066594779 2671974456 78036460
+1288754536 1682469958 56461372
+1371340411 3442489267 409818101
+3341036988 1092718505 511270380
+315486903 1857068786 37126560
+1924746231 2209682249 49360033
+1345215908 2259042282 26124503
+2917167497 2651206328 20768128
+1230231519 1034793205 57925300
+2144631239 3421335965 21153302
+2689873172 2750010916 227294325
+1974106264 1843061344 14007442
+2165784541 5296456 524088631
+1288156819 0 597717
+2937935625 3018234602 403101363
+
+soil-to-fertilizer map:
+3849355959 3101885274 170573538
+3006688391 3025445580 66663107
+1656285214 0 92188755
+2361256790 4033128077 180329908
+2073349245 3676064680 287907545
+3458323699 4213457985 81509311
+2607585697 2380345050 99923790
+2541586698 3332501375 61727497
+3789313396 3272458812 60042563
+1858319884 917612384 162600389
+404885474 510011966 407600418
+4019929497 3603127472 72937208
+812485892 1190058688 253881561
+2603314195 2073349245 4271502
+1469824760 92188755 186460454
+0 278649209 231362757
+1249323571 1443940249 220501189
+4285190709 3092108687 9776587
+1066367453 1817839802 182956118
+3257369783 2724171240 184379320
+2707509487 2480268840 111317034
+2818826521 2192483180 187861870
+1748473969 1080212773 109845915
+3441749103 3394228872 16574596
+3142507350 2077620747 114862433
+3539833010 2908550560 116895020
+231362757 1664441438 153398364
+384761121 2000795920 20124353
+3656728030 2591585874 132585366
+3073351498 3963972225 69155852
+4092866705 3410803468 192324004
+
+fertilizer-to-water map:
+2289944373 962149121 35670423
+3187295333 3295892606 34862460
+3798694276 3187295333 48036047
+3633796172 3644673845 164898104
+3222157793 3909959418 311250910
+922447685 2248438960 142418952
+648510907 2390857912 2187794
+3533408703 3809571949 100387469
+650698701 1840321280 271748984
+464371310 553340958 30176545
+3907291549 3330755066 313918779
+2791296727 461310335 25110510
+397451197 486420845 66920113
+3846730323 3235331380 60561226
+2575399801 2393045706 96151163
+1064866637 583517503 106955439
+1308190772 822897256 139251865
+0 236670371 224639964
+2671550964 0 119745763
+1171822076 2112070264 136368696
+224639964 690472942 132424314
+494547855 2489196869 153963052
+2498862112 160132682 76537689
+1447442637 997819544 842501736
+357064278 119745763 40386919
+2325614796 2643159921 173247316
+
+water-to-light map:
+3181220930 3836164803 159006567
+1405924027 2473049234 39930303
+1275636734 1411161599 10830099
+3831476263 1580605379 266491658
+1570444205 1294782382 116379217
+3133505036 2271845049 47715894
+1305612481 2512979537 100311546
+1286466833 1275636734 19145648
+167024508 145118817 64336111
+92584517 615923894 40913901
+2227655152 2098041405 130620812
+2181794752 2613291083 34326669
+433451288 209454928 64553504
+4223684323 2228662217 43182832
+3527642272 3532330812 303833991
+2855274869 2647617752 119788915
+4266867155 2319560943 28100141
+231360619 1167459710 18705935
+2136463524 3995171370 45331228
+2978600831 1421991698 154904205
+4097967921 2825698355 78160170
+0 489813287 92584517
+1686823422 3023927616 328136942
+2014960364 2903858525 116532044
+1512152517 2767406667 58291688
+395185371 1129193793 38265917
+498004792 274008432 215804855
+2975063784 3020390569 3537047
+3340227497 3352064558 180266254
+3524203227 4040502598 3439045
+713809647 656837795 472355998
+1445854330 2395217316 66298187
+3520493751 1576895903 3709476
+4176128091 2347661084 47556232
+2216121421 2461515503 11533731
+2604330501 1847097037 250944368
+2358275964 4043941643 246054537
+133498418 582397804 33526090
+2131492408 4289996180 4971116
+250066554 0 145118817
+
+light-to-temperature map:
+1212130960 1395832798 58636484
+542019293 812004214 195851408
+1706861165 2688952641 3198757
+3097592274 3018951608 116723898
+1148165381 3135675506 2936711
+938881022 300892136 26815610
+2884354982 3318488806 103553821
+789335095 421331130 149545927
+3270968199 1036156523 69989778
+1142047574 1030038716 6117807
+1710059922 1367448764 28384034
+3961474833 1257923390 109525374
+300892136 570877057 241127157
+2564647329 3422042627 200129932
+3534803741 2001828127 16273450
+1738443956 1454469282 486329977
+3717055162 2018101577 244419671
+4071000207 2781125469 223967089
+1030038716 3005092558 13859050
+737870701 358179343 20992797
+3388483069 4209077325 84901810
+3551077191 3622172559 62988195
+3614065386 2769635501 11489968
+3215304333 3262824940 55663866
+2278270544 2395185346 286376785
+1151102092 1940799259 61028868
+3625555354 4044566844 91499808
+2987908803 1106146301 109683471
+1134657064 2681562131 7390510
+2236365744 2353280546 41904800
+1270767444 3685160754 311880998
+1043897766 2262521248 90759298
+2806870879 2692151398 77484103
+3340957977 3997041752 47525092
+3214316172 4293979135 988161
+2764777261 1215829772 42093618
+965696632 379172140 42158990
+3473384879 4147658463 61418862
+2224773933 4136066652 11591811
+1582648442 3201806221 61018719
+758863498 327707746 30471597
+1643667161 3138612217 63194004
+
+temperature-to-humidity map:
+3893671309 2897869925 193525827
+1232495182 999263760 191357681
+2440090529 1477966061 163000786
+3554817869 2745268041 3258240
+2845194314 3091395752 30017739
+4087197136 1397536284 33207741
+131252236 827398049 11627380
+2183328852 2476037434 27127608
+2603091315 2503165042 242102999
+2875212053 1778930312 348370034
+1427151141 891672290 77843721
+1642958327 3928570372 200739395
+3610489285 3219006125 283182024
+3277129360 3580618829 128344865
+2233175686 1190621441 206914843
+891672290 4129309767 165657529
+0 205218291 35419402
+3584280491 3551111757 26208794
+4247745260 1430744025 47222036
+2210456460 3502188149 21171921
+1843697722 2136406304 209010485
+1423852863 3577320551 3298278
+348097907 336470527 490927522
+1057329819 3708963694 175165363
+2231628381 3549564452 1547305
+3268023402 2127300346 9105958
+142879616 0 205218291
+3558076109 3523360070 26204382
+2052708207 2345416789 130620645
+4120404877 969516011 29747749
+35419402 240637693 95832834
+4150152626 3121413491 97592634
+3223582087 3884129057 44441315
+1504994862 1640966847 137963465
+3405474225 2748526281 149343644
+
+humidity-to-location map:
+3554305993 3441523152 94289982
+4052786034 3015714705 242181262
+491965155 895492593 72049890
+2437667299 3726944956 38441480
+0 387558480 141314689
+3811971022 3765386436 101972362
+3648595975 3535813134 51583790
+1318420824 1500487572 135197760
+230758172 30039204 163596268
+3097413876 4221249785 73717511
+3041068351 3257895967 56345525
+1454254795 641271247 181430537
+394354440 1139828795 97610715
+3215016925 2618366793 339289068
+827848339 193635472 113349295
+150184459 306984767 80573713
+1778801395 2099048921 519317872
+1176891800 1379491771 111489820
+1288381620 0 30039204
+3171131387 3891749067 43885538
+564015045 528873169 112398078
+3913943384 3935634605 11560990
+2767014161 3947195595 274054190
+941197634 822701784 72790809
+1453618584 1499851361 636211
+2298119267 3587396924 139548032
+3700179765 3867358798 24390269
+3742730647 1778801395 11181531
+1013988443 967542483 20851096
+141314689 1490981591 8869770
+3925504374 3314241492 127281660
+2476108779 2088802749 10246172
+676413123 988393579 151435216
+3753912178 2957655861 58058844
+2486354951 1789982926 280659210
+3724570034 2070642136 18160613
+1034839539 1237439510 142052261
diff --git a/day_05/src/lib.rs b/day_05/src/lib.rs
new file mode 100644
index 0000000..8549a7a
--- /dev/null
+++ b/day_05/src/lib.rs
@@ -0,0 +1,138 @@
+use nom::{
+    bytes::complete::tag,
+    character::complete::{
+        self, space0, space1, alpha1, newline
+    },
+    multi::separated_list1,
+    sequence::{preceded, terminated, tuple, separated_pair},
+    IResult,
+
+};
+use std::str::FromStr;
+
+extern crate strum;
+#[macro_use] extern crate strum_macros;
+
+#[derive(Debug, Eq, PartialEq, EnumString)]
+#[strum(serialize_all = "lowercase")]
+enum Item {
+    Seed,
+    Soil,
+    Fertilizer,
+    Water,
+    Light,
+    Temperature,
+    Humidity,
+    Location,
+}
+
+#[derive(Debug, Eq, PartialEq)]
+struct ItemMap {
+    before: u64,
+    after: u64,
+    length: u64,
+}
+
+impl ItemMap {
+    pub fn convert(&self, num: u64) -> Option<u64> {
+        if self.before <= num && num < self.before + self.length {
+            Some(self.after + num - self.before)
+        } else {
+            None
+        }
+    }
+}
+
+#[derive(Debug, Eq, PartialEq)]
+struct FullMap {
+    in_type: Item,
+    out_type: Item,
+    maps: Vec<ItemMap>
+}
+
+impl FullMap {
+    pub fn convert(&self, num: u64) -> u64 {
+        let mut try_convert = self.maps.iter().filter_map(|item_map| {
+            item_map.convert(num)
+        });
+        match try_convert.next() {
+            Some(output) => output,
+            None => num,
+        }
+    }
+}
+
+// 50 98 2
+fn parse_item_map(input: &str) -> IResult<&str, ItemMap> {
+    let (input, (after, before, length)) = tuple((
+        terminated(complete::u64,space0),
+        terminated(complete::u64,space0),
+        terminated(complete::u64,space0)
+    ))(input)?;
+    Ok( (input, ItemMap{ before, after, length }) )
+}
+
+// seed-to-soil map:
+// 50 98 2
+// 52 50 48
+fn parse_full_map(input: &str) -> IResult<&str, FullMap> {
+    let (input, (in_type_string, out_type_string)) = terminated(separated_pair(alpha1, tag("-to-"), alpha1), tag(" map:\n"))(input)?;
+    let (input, maps) = separated_list1(newline, parse_item_map)(input)?;
+    let in_type = Item::from_str(in_type_string).unwrap();
+    let out_type = Item::from_str(out_type_string).unwrap();
+    Ok( (input, FullMap { in_type, out_type, maps }) )
+}
+
+// seeds: 79 14 55 13
+fn parse_seeds(input: &str) -> IResult<&str, Vec<u64>> {
+    let (input, seeds) = preceded(tag("seeds: "), separated_list1(space1, complete::u64))(input)?;
+    Ok((input, seeds))
+}
+
+fn parse_seeds_alt(input: &str) -> IResult<&str, Vec<u64>> {
+    let (input, seed_ranges) = preceded(
+        tag("seeds: "),
+        separated_list1(space1, separated_pair(complete::u64, space1, complete::u64))
+    )(input)?;
+    let mut seeds = vec![];
+    seed_ranges.into_iter().for_each(|(start, length)| { (start..start+length).for_each(|x| {seeds.push(x);}) });
+    Ok((input, seeds))
+}
+
+fn parse_all(input: &str) -> IResult<&str, (Vec<u64>, Vec<FullMap>)> {
+    let (input, seeds) = terminated(parse_seeds, tuple((newline, newline)))(input)?;
+    let (input, full_maps) = separated_list1(tuple((newline,newline)), parse_full_map)(input)?;
+    Ok((input, (seeds, full_maps)))
+}
+
+fn parse_all_alt(input: &str) -> IResult<&str, (Vec<u64>, Vec<FullMap>)> {
+    let (input, seeds) = terminated(parse_seeds_alt, tuple((newline, newline)))(input)?;
+    dbg!(seeds.len());
+    let (input, full_maps) = separated_list1(tuple((newline,newline)), parse_full_map)(input)?;
+    Ok((input, (seeds, full_maps)))
+}
+
+pub fn part1(input: &str) -> String {
+    let (_, (seeds, full_maps)) = parse_all(input).unwrap();
+    seeds.into_iter().map(|seed| {
+        full_maps.iter().fold(seed, |value, x| {
+            x.convert(value)
+        })
+    }).min().unwrap().to_string()
+}
+
+pub fn part2(input: &str) -> String {
+    let (_, (seeds, full_maps)) = parse_all_alt(input).unwrap();
+    seeds.into_iter().enumerate().map(|(i,seed)| {
+        if i % 1_000_000 == 0 { println!( "{}", i as f64 / 2291774376.0 ); }
+        full_maps.iter().fold(seed, |value, x| {
+            x.convert(value)
+        })
+    }).min().unwrap().to_string()
+}
+
+pub mod prelude {
+    pub use super::part1;
+    pub use super::part2;
+}
+
diff --git a/day_05/src/main.rs b/day_05/src/main.rs
new file mode 100644
index 0000000..d5052a5
--- /dev/null
+++ b/day_05/src/main.rs
@@ -0,0 +1,89 @@
+use day_05::prelude::*;
+
+fn main() {
+    let input = include_str!("../input.txt");
+    println!("{}", part1(input));
+    println!("{}", part2(input));
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_part1() {
+        let test_input = "seeds: 79 14 55 13
+
+seed-to-soil map:
+50 98 2
+52 50 48
+
+soil-to-fertilizer map:
+0 15 37
+37 52 2
+39 0 15
+
+fertilizer-to-water map:
+49 53 8
+0 11 42
+42 0 7
+57 7 4
+
+water-to-light map:
+88 18 7
+18 25 70
+
+light-to-temperature map:
+45 77 23
+81 45 19
+68 64 13
+
+temperature-to-humidity map:
+0 69 1
+1 0 69
+
+humidity-to-location map:
+60 56 37
+56 93 4";
+        assert_eq!(part1(test_input), "35".to_string());
+    }
+
+    #[test]
+    fn test_part2() {
+        let test_input = "seeds: 79 14 55 13
+
+seed-to-soil map:
+50 98 2
+52 50 48
+
+soil-to-fertilizer map:
+0 15 37
+37 52 2
+39 0 15
+
+fertilizer-to-water map:
+49 53 8
+0 11 42
+42 0 7
+57 7 4
+
+water-to-light map:
+88 18 7
+18 25 70
+
+light-to-temperature map:
+45 77 23
+81 45 19
+68 64 13
+
+temperature-to-humidity map:
+0 69 1
+1 0 69
+
+humidity-to-location map:
+60 56 37
+56 93 4";
+        assert_eq!(part2(test_input), "46".to_string());
+    }
+
+}