diff --git a/day-9/.gitignore b/day-9/.gitignore new file mode 100644 index 0000000..b83d222 --- /dev/null +++ b/day-9/.gitignore @@ -0,0 +1 @@ +/target/ diff --git a/day-9/Cargo.lock b/day-9/Cargo.lock new file mode 100644 index 0000000..64eb774 --- /dev/null +++ b/day-9/Cargo.lock @@ -0,0 +1,94 @@ +# This file is automatically @generated by Cargo. +# It is not intended for manual editing. +[[package]] +name = "day-9" +version = "0.1.0" +dependencies = [ + "indoc", + "itertools", +] + +[[package]] +name = "either" +version = "1.6.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "e78d4f1cc4ae33bbfc157ed5d5a5ef3bc29227303d595861deb238fcec4e9457" + +[[package]] +name = "indoc" +version = "0.3.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "47741a8bc60fb26eb8d6e0238bbb26d8575ff623fdc97b1a2c00c050b9684ed8" +dependencies = [ + "indoc-impl", + "proc-macro-hack", +] + +[[package]] +name = "indoc-impl" +version = "0.3.6" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "ce046d161f000fffde5f432a0d034d0341dc152643b2598ed5bfce44c4f3a8f0" +dependencies = [ + "proc-macro-hack", + "proc-macro2", + "quote", + "syn", + "unindent", +] + +[[package]] +name = "itertools" +version = "0.9.0" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "284f18f85651fe11e8a991b2adb42cb078325c996ed026d994719efcfca1d54b" +dependencies = [ + "either", +] + +[[package]] +name = "proc-macro-hack" +version = "0.5.19" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "dbf0c48bc1d91375ae5c3cd81e3722dff1abcf81a30960240640d223f59fe0e5" + +[[package]] +name = "proc-macro2" +version = "1.0.24" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "1e0704ee1a7e00d7bb417d0770ea303c1bccbabf0ef1667dae92b5967f5f8a71" +dependencies = [ + "unicode-xid", +] + +[[package]] +name = "quote" +version = "1.0.7" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "aa563d17ecb180e500da1cfd2b028310ac758de548efdd203e18f283af693f37" +dependencies = [ + "proc-macro2", +] + +[[package]] +name = "syn" +version = "1.0.54" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "9a2af957a63d6bd42255c359c93d9bfdb97076bd3b820897ce55ffbfbf107f44" +dependencies = [ + "proc-macro2", + "quote", + "unicode-xid", +] + +[[package]] +name = "unicode-xid" +version = "0.2.1" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "f7fe0bb3479651439c9112f72b6c505038574c9fbb575ed1bf3b797fa39dd564" + +[[package]] +name = "unindent" +version = "0.1.7" +source = "registry+https://github.com/rust-lang/crates.io-index" +checksum = "f14ee04d9415b52b3aeab06258a3f07093182b88ba0f9b8d203f211a7a7d41c7" diff --git a/day-9/Cargo.toml b/day-9/Cargo.toml new file mode 100644 index 0000000..433f2ea --- /dev/null +++ b/day-9/Cargo.toml @@ -0,0 +1,11 @@ +[package] +name = "day-9" +version = "0.1.0" +authors = ["Tristan Daniël Maat "] +edition = "2018" + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +indoc = "0.3" +itertools = "0.9" diff --git a/day-9/input b/day-9/input new file mode 100644 index 0000000..4d7d8d9 --- /dev/null +++ b/day-9/input @@ -0,0 +1,1000 @@ +10 +17 +27 +3 +14 +30 +50 +23 +9 +43 +18 +47 +11 +19 +37 +41 +2 +21 +40 +36 +15 +8 +7 +13 +49 +5 +22 +48 +28 +10 +12 +14 +27 +16 +9 +24 +17 +18 +20 +11 +19 +23 +25 +21 +26 +29 +30 +31 +15 +32 +33 +34 +22 +36 +37 +28 +64 +35 +41 +27 +38 +63 +40 +56 +45 +47 +52 +42 +43 +57 +44 +46 +48 +49 +54 +50 +70 +58 +62 +55 +66 +82 +85 +120 +94 +78 +98 +83 +89 +164 +87 +97 +86 +110 +168 +96 +116 +99 +186 +264 +160 +141 +144 +253 +121 +149 +167 +181 +161 +170 +165 +169 +172 +197 +251 +185 +182 +333 +363 +257 +195 +215 +220 +354 +326 +332 +308 +303 +270 +548 +437 +328 +521 +330 +334 +337 +578 +357 +367 +377 +415 +397 +662 +435 +498 +410 +691 +787 +573 +693 +602 +600 +740 +598 +658 +664 +665 +667 +937 +671 +988 +724 +734 +744 +1137 +807 +845 +1333 +908 +1237 +1012 +1173 +1200 +1171 +1472 +1198 +1322 +2484 +1256 +1325 +1329 +1332 +1391 +2585 +1468 +1857 +1458 +1478 +2410 +1652 +2523 +1753 +2183 +1920 +2344 +2185 +2369 +2670 +2496 +2454 +3378 +2588 +2581 +2647 +2661 +2807 +2723 +2946 +2926 +4129 +3802 +2936 +3231 +3405 +3673 +5143 +3938 +5270 +5228 +5596 +5295 +8827 +5157 +4950 +5042 +5235 +5169 +5242 +7917 +5384 +10185 +5649 +5862 +6157 +8548 +8273 +6167 +6636 +7078 +7611 +9095 +10192 +9992 +10107 +10211 +10452 +10119 +10199 +10891 +10553 +10404 +14689 +11104 +11033 +11246 +11511 +14705 +14430 +15884 +13714 +12803 +16359 +14247 +16706 +17603 +20203 +20099 +20111 +20226 +23925 +36458 +20318 +20603 +35995 +20957 +21508 +34931 +60383 +23836 +44024 +25941 +40521 +26517 +30953 +27050 +33121 +41607 +40542 +34309 +37702 +40210 +80609 +40429 +60294 +77145 +40921 +47120 +42465 +67971 +63643 +45344 +71382 +71874 +49777 +60826 +52458 +53567 +57470 +64752 +60171 +67430 +94488 +72011 +74519 +77912 +80639 +82894 +81350 +154905 +83386 +120997 +95121 +87809 +128395 +102814 +110603 +109928 +106025 +173455 +114393 +111037 +113738 +159240 +127601 +132182 +223811 +146530 +149923 +176471 +158551 +208951 +164244 +178507 +248598 +308474 +220418 +182930 +190623 +208839 +212742 +215953 +217062 +277524 +224775 +241994 +291422 +274131 +368191 +259783 +432682 +337058 +341481 +354867 +322795 +387458 +389019 +342751 +596297 +415398 +391769 +373553 +395672 +582578 +421581 +441837 +433015 +547570 +567526 +466769 +762572 +533914 +596841 +774496 +602534 +659853 +884628 +976087 +764632 +665546 +716304 +1029312 +1011695 +765322 +769225 +813350 +1417924 +817253 +854596 +1213116 +2189203 +2067712 +1136448 +1034295 +1418542 +1130755 +1199460 +1199375 +1371759 +1262387 +1964782 +1381850 +2296682 +1430178 +1694858 +1481626 +1534547 +1578672 +1582575 +1968600 +1851548 +3346632 +1671849 +1888891 +2170743 +2330130 +2393142 +2233670 +2406054 +2954334 +2753609 +2734007 +2461762 +3043608 +2744013 +4265282 +4336184 +3991540 +3176484 +3016173 +3060298 +3113219 +3161247 +4626183 +3523397 +7325580 +3560740 +3842592 +4924352 +5064137 +4563800 +4867816 +4639724 +5769782 +5195769 +5505370 +5804311 +9203524 +6221545 +5760186 +6173517 +6076471 +6576913 +7677019 +6129392 +11889380 +6274466 +10100310 +7084137 +7403332 +10701139 +12872788 +9627937 +11417314 +9431616 +9507540 +9835493 +11574093 +12205863 +12082283 +11977828 +12798458 +11836657 +11889578 +23395142 +12249988 +14761156 +17777329 +12403858 +13213529 +13358603 +21035622 +14487469 +16515753 +21268273 +18939156 +26011987 +21485368 +19267109 +21005709 +27165014 +23410750 +23463671 +23726235 +31021439 +23814485 +27700998 +24086645 +34028265 +26737457 +24653846 +25617387 +35454909 +29874356 +26572132 +27846072 +31003222 +45508908 +35782862 +38206265 +50098632 +45572013 +48064596 +40272818 +44416459 +50298367 +46874421 +47189906 +47540720 +47901130 +81929395 +54583529 +48740491 +67010275 +57720428 +50271233 +52189519 +76843365 +54418204 +76670764 +58849294 +82972768 +82657283 +89013309 +78479083 +88337414 +84689277 +87147239 +87462724 +91290880 +95930397 +128860283 +95091036 +125859569 +96641621 +155490915 +181049802 +99011724 +102460752 +104689437 +129032884 +169804522 +113267498 +131088968 +135520058 +137328377 +170120007 +167492392 +175484653 +163168360 +200414737 +171836516 +190302604 +178753604 +186381916 +194942121 +191732657 +203701161 +195653345 +292819292 +234531782 +280174090 +274493959 +266361261 +217956935 +242300382 +437662319 +394003765 +266609026 +272848435 +300496737 +363145737 +358218432 +468303945 +335004876 +532970287 +350590120 +374406949 +370486261 +378114573 +390595466 +387386002 +399354506 +413610280 +650963008 +661879961 +515148817 +490805370 +694500502 +1132162821 +508909408 +539457461 +624827458 +567105763 +660234437 +635501613 +705491137 +867975163 +1260329071 +874462337 +721076381 +804205746 +744893210 +748600834 +765500575 +1057911133 +896295410 +812964786 +904415650 +999714778 +1005954187 +1862116879 +1030262831 +1076015171 +1048366869 +1106563224 +1164284919 +1373428292 +1356577994 +1295736050 +1340992750 +1661795985 +1465969591 +1904725168 +1469677215 +1486576956 +1493494044 +2938132050 +1754555021 +1669916225 +1709260196 +3241131977 +1812679564 +1504371145 +3026494219 +2036217018 +2078629700 +2877799437 +2270848143 +3195837152 +2402299274 +2460020969 +4661806743 +5008516716 +2636728800 +3153672314 +2935646806 +3548306915 +2956254171 +2963171259 +3833184721 +2997865189 +3174287370 +3213631341 +3540588163 +3317050709 +5319761677 +5034883871 +3583000845 +4971863824 +4956429137 +4480928974 +4673147417 +6367303655 +5358553445 +4862320243 +7659671932 +5572375606 +10043400587 +5592982971 +5954119360 +5891900977 +7818574414 +6538453352 +8036607613 +6172152559 +6211496530 +6387918711 +7797979683 +14165283338 +9818749380 +11040451072 +8554864669 +8063929819 +13252654903 +9154076391 +9343249217 +9535467660 +13752099043 +11846020337 +10434695849 +16633434043 +13370355289 +19197476978 +15710650357 +12383649089 +23700750998 +14942783380 +22805586602 +14208760172 +12560071270 +12599415241 +14185898394 +15861909502 +27937997437 +27326432469 +16618794488 +17218006210 +17407179036 +18497325608 +33269088538 +18878716877 +21919116749 +22280716186 +41535192641 +22818344938 +24943720359 +30588361499 +36415483188 +24983064330 +25159486511 +26745969664 +37543135600 +26768831442 +46816714314 +39925847710 +46205149346 +43861781207 +73585545756 +62206563896 +33836800698 +40778041794 +34625185246 +58334599937 +37376042485 +40797833626 +47977831449 +69023494284 +57334331163 +51751895772 +49926784689 +50103206870 +50142550841 +51729033994 +51905456175 +51928317953 +96831749142 +70630612649 +61394016688 +68461985944 +71212843183 +72001227731 +86354219240 +83940007568 +89281498660 +82603016695 +101855102642 +84767736087 +129547443120 +92526867620 +123118299358 +97904616138 +100245757711 +101655818683 +252665742478 +100029991559 +101832240864 +120773163490 +134508472870 +103833774128 +113322334641 +132024629337 +150675515348 +129856002632 +152401993512 +143214070914 +154604244426 +166543024263 +167370752782 +221018921201 +202077998575 +227035340490 +177294603707 +190431483758 +232054620896 +197934607697 +247830807511 +200275749270 +222605404354 +201862232423 +203863765687 +205666014992 +217156108769 +320287486390 +233689776760 +298567653600 +331898848133 +321147268689 +273070073546 +295616064426 +333645554672 +356974508021 +357802236540 +344665356489 +437720635888 +460725117250 +367726087465 +550331371481 +388366091455 +398210356967 +818527353790 +402137981693 +476933839233 +405725998110 +407528247415 +676564204622 +594183718026 +450845885529 +506759850306 +686933745055 +568686137972 +750391354599 +594217342235 +671280430513 +629261619098 +678310911161 +1089071726748 +763528234650 +712391443954 +1365244656216 +2052178401271 +756092178920 +805738604382 +786576448422 +1019532023501 +1399922322408 +807863979803 +1071117557259 +813254245525 +858374132944 +957605735835 +1188401060261 +1045063227764 +1441839145811 +1197947757070 +1162903480207 +1223478961333 +1265497772748 +2029026007398 +2588723617549 +1390702355115 +1468483622874 +1850801832146 +3048749589216 +1744182184257 +1877906156445 +1599830693947 +1592315052804 +2116180785023 +1621118225328 +2213176567933 +1666238112747 +1671628378469 +2281737868399 +1815979868779 +3294523780146 +2207966707971 +2243010984834 +2386382441540 +3056940467862 +2428401252955 +2488976734081 +2656200127863 +2859185977989 +3220948919275 +2983017407919 +3068314316821 +3192145746751 +4696943442052 +3800281760775 +3213433278132 +3258553165551 +3263943431273 +3437098094107 +3292746603797 +3337866491216 +3482217981526 +3953366246868 +4097717737178 +4864166835834 +5102196962823 +4450977692805 +4671412237789 +4814783694495 +5713140595725 +6879378945760 +5145176861944 +5842203385908 +6051331724740 +6175163154670 +6601809922489 +6260460063572 +6405579024883 +6471986443683 +6477376709405 +6506179881929 +6820084472742 +6556690035070 +6630613095013 +6774964585323 +7435584228394 +8769129974967 +10577307431559 +8548695429983 +9122389930594 +12472816480921 +9265761387300 +9486195932284 +9959960556439 +12118719620608 +10987380247852 +12732446507255 +11893535110648 +12226494879410 +15029590038539 +12737836772977 +13062869916999 +12877565468566 +13136792976942 +12983556591334 +24050250164851 +15105385465053 +13187303130083 +13405577680336 +14210548813717 +18034891362267 +24787856245276 +19699697362153 +17671085360577 +27273418730716 +19446156488723 +18751957319584 +20473576180136 +20947340804291 +27194105405051 +22880915358500 +24120029990058 +27907155507105 +26592880810419 +31222194492350 +27843222238030 +25861122059900 +26389134271670 +27397851943800 +26170859721417 +31440469042603 +28510963145389 +45942046869372 +27616126494053 +53568711665217 +37117241849300 +40552000719077 +38144661540713 +44060219632247 +66051817047818 +38198113808307 +39225533499720 +41420916984427 +43828256162791 +58416299897401 +47000945348558 +52250256331570 +52031981781317 +52454002870319 +52559993993087 +53258974003700 +77893103841217 +53786986215470 +65760788034766 +66841659993773 +56127089639442 diff --git a/day-9/src/main.rs b/day-9/src/main.rs new file mode 100644 index 0000000..3f8c51f --- /dev/null +++ b/day-9/src/main.rs @@ -0,0 +1,134 @@ +use std::fs; +use std::num::ParseIntError; + +use itertools::{Itertools, MinMaxResult}; + +fn main() -> Result<(), Box> { + let input = fs::read_to_string("input")?; + let xmas = parse_xmas(&input)?; + + // Part 1 + let result = find_not_summed(&xmas, 25)?; + println!("{}", result); + + // Part 2 + let result = find_weakness(&xmas, result)?; + println!("{}", result); + + Ok(()) +} + +fn parse_xmas(input: &str) -> Result, ParseIntError> { + input.lines().map(|line| line.parse()).collect() +} + +fn find_weakness(xmas: &Vec, key: u64) -> Result { + // Now we use the key to find the weakness, by getting all + // possible sub-sumbs of the list of numbers, and finding the one + // that happens to match our key + let weak_window = (2..xmas.len()) + .find_map(|window_size| { + xmas.windows(window_size) + .find(|window| window.iter().sum::() == key) + }) + .ok_or("Could not find a weakness")?; + + if let MinMaxResult::MinMax(min, max) = weak_window.iter().minmax() { + Ok(min + max) + } else { + unreachable!("We must have at least two elements due to the window size") + } +} + +fn find_not_summed(xmas: &Vec, window_size: usize) -> Result { + xmas.windows(window_size + 1) + .find_map(|window| { + if let [preamble @ .., number] = window { + // If none of the number combinations in the preamble + // sum to the final number, we've got the key! + if !preamble + .iter() + .combinations(2) + .any(|combination| combination.into_iter().sum::() == *number) + { + Some(*number) + } else { + None + } + } else { + unreachable!("The windows must all have a length of at least 1"); + } + }) + .ok_or("Could not find the entry") +} + +#[cfg(test)] +mod tests { + use super::*; + use indoc::indoc; + + #[test] + fn test_simple() -> Result<(), Box> { + let input = indoc!( + "35 + 20 + 15 + 25 + 47 + 40 + 62 + 55 + 65 + 95 + 102 + 117 + 150 + 182 + 127 + 219 + 299 + 277 + 309 + 576" + ); + + let xmas = parse_xmas(input)?; + let result = find_not_summed(&xmas, 5)?; + + assert_eq!(result, 127); + Ok(()) + } + + #[test] + fn test_simple2() -> Result<(), Box> { + let input = indoc!( + "35 + 20 + 15 + 25 + 47 + 40 + 62 + 55 + 65 + 95 + 102 + 117 + 150 + 182 + 127 + 219 + 299 + 277 + 309 + 576" + ); + + let xmas = parse_xmas(input)?; + let key = find_not_summed(&xmas, 5)?; + let result = find_weakness(&xmas, key)?; + + assert_eq!(result, 62); + Ok(()) + } +} diff --git a/shell.nix b/shell.nix index 232285d..9ce587d 100644 --- a/shell.nix +++ b/shell.nix @@ -8,10 +8,9 @@ with pkgs; mkShell { buildInputs = [ - rustChannel.rust + rust-analyzer # the one from Mozilla is slightly broken https://github.com/mozilla/nixpkgs-mozilla/issues/238 + (pkgs.latest.rustChannels.stable.rust.override { + # extensions = ["rust-src"]; # unneeded because we're using rust-analyzer from nixpkgs + }) ]; - - shellHook = '' - export RUST_SRC_PATH="${rustChannel.rust-src}/lib/rustlib/src/rust/library" - ''; }