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# This file is automatically @generated by Cargo.
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# It is not intended for manual editing.
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version = 3
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[[package]]
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name = "cfg-if"
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version = "1.0.0"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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[[package]]
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name = "day17"
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version = "0.1.0"
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dependencies = [
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"petgraph",
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"test-case",
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]
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[[package]]
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name = "equivalent"
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[[package]]
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name = "indexmap"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"equivalent",
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"hashbrown",
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]
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[[package]]
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name = "petgraph"
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version = "0.6.4"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"fixedbitset",
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"indexmap",
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]
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[[package]]
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name = "proc-macro2"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"unicode-ident",
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]
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[[package]]
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name = "quote"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"proc-macro2",
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[[package]]
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name = "syn"
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version = "2.0.41"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"proc-macro2",
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"quote",
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"unicode-ident",
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]
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[[package]]
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name = "test-case"
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version = "3.3.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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checksum = "eb2550dd13afcd286853192af8601920d959b14c401fcece38071d53bf0768a8"
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dependencies = [
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"test-case-macros",
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]
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[[package]]
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name = "test-case-core"
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version = "3.3.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"cfg-if",
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"proc-macro2",
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"quote",
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"syn",
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]
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[[package]]
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name = "test-case-macros"
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version = "3.3.1"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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dependencies = [
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"proc-macro2",
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"quote",
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"syn",
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"test-case-core",
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]
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[[package]]
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name = "unicode-ident"
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source = "registry+https://github.com/rust-lang/crates.io-index"
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@ -1,10 +0,0 @@
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[package]
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name = "day17"
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version = "0.1.0"
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edition = "2021"
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# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
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[dependencies]
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petgraph = "0.6.4"
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test-case = "3.3.1"
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141
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17/input
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|
||||||
318164852453224592729434559244754674699557743559876747474974585695598957859985857696997477665456486667857796243525567741256626585522827113358
|
|
||||||
256655568346617621446653354665386832434445968933784544487764789798668576865577679764775445666453683457777446985583583616592962898181266224478
|
|
||||||
722447327541895771712452547924633958699394955868486968595868665886977559577966765766677478787645777643444882329378355275571729256528663733353
|
|
||||||
681245847143816872485464897478336665868833439643778745577556798997858795969859958658867557947956848853484479399665572351893714995112671712542
|
|
||||||
311381662366127117979691628467662497783389559654568448976988776969785977759865769596989799759496863598934465593797484374132873555158552238226
|
|
||||||
457474782125292676291123633778348492667699397478487495797899579777688999595566576657978586657959548666375867799586695984632767442686385738552
|
|
||||||
446616157875894869538721247895884644444883958939694686857454797576766596769678977878866756444843564374954453689422974856237432393117533128483
|
|
||||||
328513874786178732292652989455568257546978333547685649556859556989785958697896996969558664777693669444863357795442386542131312425674116545188
|
|
||||||
747847212285726534863559799474986827436555837479976774676546886866957568785596798586957654994685373975436492788443972514832361138572512654161
|
|
||||||
655775232613722364914271538968599287798576387849966696886855689868858988569956769648644589884777963696793654854647956227921717275975785623654
|
|
||||||
133381381437798727198762329677547326989373878353369696599978596599769677757779877555897759958668785498543442888697699371483636586223726547367
|
|
||||||
166558274267818548162234882895355743538677453683879454994868498865956757789887798484954454444478588833833824986689655715894154174185774415242
|
|
||||||
744372761363824188479933164279993635485947644456865846757657575569785868879855879598958794566895394956885434499837577347367422731518858612887
|
|
||||||
542154878866234222341249936289547276863933653697495455886575579875575878577655884578868949868795478447448539675945826676344156515447648384546
|
|
||||||
727648137147279312991745915569869748967897863693484548957585769676995776768899556467797877594595457565597942644325989896333716781667423243534
|
|
||||||
736513883717638924144115229662225798979374855467873564897654895888778776656646759488994944578647478549466472243343448517571862675853473616864
|
|
||||||
472573641838727179484843174326596238323797674954847658846499779979687897698786957488978957887393589648535875663387463691985638774236788623553
|
|
||||||
124821288351532635578793553795832779774448696673767567977447858477887878676469566499588899639674834547757355447365486454925564374273415537754
|
|
||||||
473366376825217384388358298858346676865647498858449537467576484448696554994844568658866985448999588568865694253572422898257449323363556414355
|
|
||||||
756585744556785281389581638793733695364655945467738676966784699696586944796568967556964687873563733383939393423897564823324453861637182853267
|
|
||||||
565377885838215871729589251946467492483786596678474736965759584646969695859846694554478644897956448493988952388686515531438553966563718473673
|
|
||||||
441237555152315781715534724764569644764966484434597935577849549996797944445598866585975464985538857347348739935777224728123383154322783665212
|
|
||||||
251538277583635525788213179949236983839585564657438535396857976586555596886987597784677479797768335698476345286595542471641181174621263365826
|
|
||||||
462645455814621845373415692662396785686584794946537846843758755467475597488876849747653439958865548869549767695386323199852847441248375338541
|
|
||||||
463546443547812219518172999856822775645249657899384888764384466588464496998699844799448386644993497387873285579539449217398533624347675543541
|
|
||||||
627134585837711668423259691198344552573775794347737374846947567564477798747547569756586957548779437697554747233864289854679427672835612465345
|
|
||||||
453427178468376465724244651434249467592372777377954886698995943799758965795489579878489647936487995475548384882447855836557219515272555272172
|
|
||||||
646164887363484557947971139665942397924584239956839476743645386597748689975975793667755335566355545754464596682873886675359686766371416867421
|
|
||||||
242564673372458178195363168781494567985469634643657747396363336558884388469558778894739837494797653627595967524589231722865526482421344174765
|
|
||||||
527234341744655648884683415323364239475568742248669646473336993435343838488698565959659888897554832493926543963268996957491745744384373681642
|
|
||||||
551517286282283171869299626636836973839926825529596737846853348847465543768893358499548363898668447899594793834437575675969522241126258282432
|
|
||||||
615113281186772747348241311277589768978579523525454785944673364478779885777788637938457768565594782776753548337442956913497758522663855544746
|
|
||||||
642722552558282717243186261369979747472328286247489597466575759788373865579784983835765597583957266269348476872977744141394534221775432834361
|
|
||||||
123255132786848881171289778858576544965558689395978795886845857873584539756667349675894535384688837649796799842596341266977334763116825677354
|
|
||||||
135221265824413236323157332895552381288822335555367339575879847894968958335438953379578775739548683874737377552721612721268151575627367374516
|
|
||||||
531372144561436544581261647461429475295794262997752694655885563973854977878549545376756598298288663367593432222189358593241862862567851525633
|
|
||||||
626241253623585223276449612369373315149376774267977495966454874953877799753954666837937985625362576929726958529984811986441465531615443642317
|
|
||||||
122237265686782174111763222458711389313762597662727299449372464353975654883644949566273662646296682598256439817316833461554838162575673712517
|
|
||||||
723263336441628827211586677967134954541492446275676949475759793974657373976875788542576364482493264736749878125328845632357141826286877316536
|
|
||||||
746376624247554234116778248423662686389547589753843874724295634799738747329256738622227935656823782646258367494222758652264524554281143475725
|
|
||||||
247227652554571866348233254561957766785945979683577957537487658236743744853762365675828364963779438767411174735912626572384742318221667753414
|
|
||||||
461752271733674688288542747127735521232319836579345595948435736687542357563568686627638662657552627936242586561889286338386747748155235227226
|
|
||||||
141456214273548658577623736731491554843413163948364432765456955986253284949329344329743583497259864561513822597516642174356653353313422722126
|
|
||||||
577514122213115543664523815812933592181557923163353748687669465747247978699468957873884592954895372236525435898266267231166186788652617642555
|
|
||||||
733555724377412472456818878267576986747564915594433739398666323228924448924829375982299639364766271435835929364781825316741447833326252417676
|
|
||||||
125222215152346652574685537442585295255477117856958664574265466997244968429967625364878556825897669923262572691766582725557644262753327717362
|
|
||||||
467157357433453135876225656776561727957327836923637932444972557496674222793666868922685325945691218298588167748387555736343614515634266527674
|
|
||||||
661776217564727341161434734284475862238735522767927168825678229454593732375258543947793974965685418316392331831342662517514464432121762671112
|
|
||||||
322226175666414714887813726538477315884488153872775481665957678523393653399286989356544792237258381256625891911364264883241763171167313676775
|
|
||||||
535433463745172562637474314438863546768596275157472615456823332796577429439255648883176346627241779499894798781815684141341115432556456643611
|
|
||||||
114516531415276157226232376712646274882692898428926131576766198472672582965649659239179984932272293221585428551187274518216722651334142336632
|
|
||||||
442465354622731723346571118328123567571116964772317433275893126613648877241944321925876477183764936251413286113213668326238173555355732216511
|
|
||||||
464545125331445744558616761437753623789891666294688255519735998824794952561825912628843557695114221545433384531731727161876473665573223373362
|
|
||||||
212622623666153674544543171825717224778543394854587565145835173211764734896255693756825741544633558375382657436484353324273475751235436535462
|
|
||||||
426456174161671373114214337372228811531433159234863841562359873663253579618768533225871676475124418634651463174367571421653316524135337216611
|
|
||||||
113264262762756157661221337642236412865163476628461551865256687522447798169631776999765762811667378264167441455366366874635763265145354445246
|
|
||||||
426635433223761674317156651435514314141128668545421467652684475967588596316618624557527821975129731666663738726663526335152162713322637353345
|
|
||||||
462625221553613622135255778417362232144315611424115765534629998153728136584747684638152634448139174522524258188274866446444754542614324644434
|
|
||||||
636534326173461144145272421245357854354484176813154881324324289844919955923398583536826126465974374482435317112341641177362167413653631136334
|
|
||||||
416121433661766275322466215778242625365252727337453283172471359263773988811988214463424763681262168421538852447148623325417465263633614152511
|
|
||||||
124165661313426677723346621157741741434378575443131887844322537341118644829916279535424761288166365435817422811564415651251116735711112164331
|
|
||||||
662213565461615664773261415161352365348334351167211364117737811331482474651845215456825315271337675186362621741624741731455143163362536213464
|
|
||||||
353163654655614552631221351147137158834856172472651447352645383627716833776783781867423336224623844544643183687212315514251544774456463166616
|
|
||||||
362441211445555544364416561477266288188517416482572255534821166861673587523181878873186281844855832334752187362742345667727277112563315642334
|
|
||||||
431663234654426537411563411631545147111423513725427621386471155234676712466243246352318626253227328241736815415232666553761366744242426616315
|
|
||||||
226531133633364435742641727266657131716261514281311262288684766444656242277146665425754546527885447432126232726412333341234543363451443141151
|
|
||||||
132441514114413263365254644654352543741828713741248814178464374241323848417341456825584538518825768881832262324114555671261641363331666134362
|
|
||||||
214126421452663325372554676727131463574734212374262156347777366377688162741748146151838743887681761444327446474521671324576334665511114122421
|
|
||||||
351531625361155425124432552645227655625173237845122258431184132246265282346434414371684686452682717564246721521767254276776656342611514416424
|
|
||||||
524134632564656514234312513351122255327641524888853223216877477886352121843137683831631511821167821614336237522461471235761565432361122352514
|
|
||||||
345434525245243335351164562536536325371562644423648433177446878843262728235726362818655267541335336453673667665743636625434415221611313542325
|
|
||||||
352232633361461221226332237671657471766723622375425212675228865561486835238657116512354337544131231554276255267433543145221253624656265664213
|
|
||||||
533341362332521262331624612755675274227615131761716775227664373273765866252331525736334615365731142562664711644136322541112142123112632614445
|
|
||||||
335424225554551224465145365617415232333565263422662657463575357742412565884351458348627343152461236262431544374247365213446446134632223333414
|
|
||||||
448
17/src/main.rs
448
17/src/main.rs
@ -1,448 +0,0 @@
|
|||||||
use std::collections::hash_map::RandomState;
|
|
||||||
use std::collections::{BinaryHeap, HashMap};
|
|
||||||
use std::fmt::{Display, Write};
|
|
||||||
use std::fs::File;
|
|
||||||
use std::io::{BufRead, BufReader, Lines};
|
|
||||||
use std::iter::repeat;
|
|
||||||
use std::time::Instant;
|
|
||||||
|
|
||||||
use petgraph::algo::dijkstra;
|
|
||||||
use petgraph::prelude::*;
|
|
||||||
|
|
||||||
// BOILERPLATE
|
|
||||||
type InputIter = Lines<BufReader<File>>;
|
|
||||||
|
|
||||||
fn get_input() -> InputIter {
|
|
||||||
let f = File::open("input").unwrap();
|
|
||||||
let br = BufReader::new(f);
|
|
||||||
br.lines()
|
|
||||||
}
|
|
||||||
|
|
||||||
fn main() {
|
|
||||||
let start = Instant::now();
|
|
||||||
let ans1 = problem1(get_input());
|
|
||||||
let duration = start.elapsed();
|
|
||||||
println!("Problem 1 solution: {} [{}s]", ans1, duration.as_secs_f64());
|
|
||||||
|
|
||||||
let start = Instant::now();
|
|
||||||
let ans2 = problem2(get_input());
|
|
||||||
let duration = start.elapsed();
|
|
||||||
println!("Problem 2 solution: {} [{}s]", ans2, duration.as_secs_f64());
|
|
||||||
}
|
|
||||||
|
|
||||||
// PARSE
|
|
||||||
|
|
||||||
#[derive(Clone, Copy, PartialEq, Eq, Debug, Hash)]
|
|
||||||
enum Direction {
|
|
||||||
Left,
|
|
||||||
Right,
|
|
||||||
Up,
|
|
||||||
Down,
|
|
||||||
}
|
|
||||||
|
|
||||||
impl Direction {
|
|
||||||
const fn all() -> &'static [Self; 4] {
|
|
||||||
&[
|
|
||||||
Direction::Left,
|
|
||||||
Direction::Right,
|
|
||||||
Direction::Up,
|
|
||||||
Direction::Down,
|
|
||||||
]
|
|
||||||
}
|
|
||||||
const fn opposite(&self) -> Self {
|
|
||||||
match self {
|
|
||||||
Direction::Left => Direction::Right,
|
|
||||||
Direction::Right => Direction::Left,
|
|
||||||
Direction::Up => Direction::Down,
|
|
||||||
Direction::Down => Direction::Up,
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
struct CityMap {
|
|
||||||
map: Vec<Vec<u64>>,
|
|
||||||
}
|
|
||||||
|
|
||||||
impl CityMap {
|
|
||||||
fn offset_pos(&self, pos: (usize, usize), dir: &Direction) -> Option<(usize, usize)> {
|
|
||||||
match dir {
|
|
||||||
Direction::Left if pos.0 > 0 => Some((pos.0 - 1, pos.1)),
|
|
||||||
Direction::Right if pos.0 < self.map[0].len() - 1 => Some((pos.0 + 1, pos.1)),
|
|
||||||
Direction::Up if pos.1 > 0 => Some((pos.0, pos.1 - 1)),
|
|
||||||
Direction::Down if pos.1 < self.map.len() - 1 => Some((pos.0, pos.1 + 1)),
|
|
||||||
_ => None,
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
type Position = (usize, usize);
|
|
||||||
|
|
||||||
struct WalkCost<'a> {
|
|
||||||
start: Position,
|
|
||||||
cost_from: Vec<Vec<HashMap<(Direction, usize), u64>>>,
|
|
||||||
dir_to: HashMap<Position, Direction>,
|
|
||||||
map: &'a CityMap,
|
|
||||||
}
|
|
||||||
|
|
||||||
#[derive(Debug)]
|
|
||||||
struct Move {
|
|
||||||
new_pos: Position,
|
|
||||||
dir: &'static Direction,
|
|
||||||
consecutive: usize,
|
|
||||||
weight: u64,
|
|
||||||
}
|
|
||||||
|
|
||||||
impl PartialEq for Move {
|
|
||||||
fn eq(&self, other: &Self) -> bool {
|
|
||||||
self.weight == other.weight
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
impl Eq for Move {}
|
|
||||||
|
|
||||||
impl PartialOrd for Move {
|
|
||||||
fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
|
|
||||||
Some(self.cmp(other))
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
impl Ord for Move {
|
|
||||||
fn cmp(&self, other: &Self) -> std::cmp::Ordering {
|
|
||||||
std::cmp::Reverse(self.weight).cmp(&std::cmp::Reverse(other.weight))
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
impl<'a> WalkCost<'a> {
|
|
||||||
fn from_map(map: &'a CityMap, start: Position) -> Self {
|
|
||||||
Self {
|
|
||||||
map,
|
|
||||||
start,
|
|
||||||
cost_from: map
|
|
||||||
.map
|
|
||||||
.iter()
|
|
||||||
.map(|row| repeat(HashMap::new()).take(row.len()).collect())
|
|
||||||
.collect(),
|
|
||||||
dir_to: HashMap::new(),
|
|
||||||
}
|
|
||||||
}
|
|
||||||
fn compute(&mut self) {
|
|
||||||
let mut unvisited_next_moves: BinaryHeap<Move> = BinaryHeap::new();
|
|
||||||
let valid_start_moves: Vec<Move> = Direction::all()
|
|
||||||
.iter()
|
|
||||||
.filter_map(|dir| {
|
|
||||||
self.map.offset_pos(self.start, dir).and_then(|pos| {
|
|
||||||
Some(Move {
|
|
||||||
new_pos: pos,
|
|
||||||
dir,
|
|
||||||
consecutive: 1,
|
|
||||||
weight: self.map.map[pos.1][pos.0],
|
|
||||||
})
|
|
||||||
})
|
|
||||||
}) // valid positions
|
|
||||||
.collect();
|
|
||||||
|
|
||||||
for m in valid_start_moves {
|
|
||||||
unvisited_next_moves.push(m);
|
|
||||||
}
|
|
||||||
|
|
||||||
while let Some(cur_move) = unvisited_next_moves.pop() {
|
|
||||||
// we've been here already at a lower cost
|
|
||||||
// if cur_move.weight >= self.cost_to[cur_move.new_pos.1][cur_move.new_pos.0] {
|
|
||||||
// continue;
|
|
||||||
// }
|
|
||||||
if let Some(last_weight) = self.cost_from[cur_move.new_pos.1][cur_move.new_pos.0]
|
|
||||||
.get(&(*cur_move.dir, cur_move.consecutive))
|
|
||||||
{
|
|
||||||
if cur_move.weight < *last_weight {
|
|
||||||
self.cost_from[cur_move.new_pos.1][cur_move.new_pos.0]
|
|
||||||
.insert((*cur_move.dir, cur_move.consecutive), cur_move.weight);
|
|
||||||
} else {
|
|
||||||
continue;
|
|
||||||
} // visited before at lower cost }
|
|
||||||
} else {
|
|
||||||
self.cost_from[cur_move.new_pos.1][cur_move.new_pos.0]
|
|
||||||
.insert((*cur_move.dir, cur_move.consecutive), cur_move.weight);
|
|
||||||
}
|
|
||||||
// println!("state at {:?}: {:?}", cur_move, self.cost_from[cur_move.new_pos.1][cur_move.new_pos.0]);
|
|
||||||
|
|
||||||
let valid_moves = Direction::all().iter().filter_map(|dir| {
|
|
||||||
self.map
|
|
||||||
.offset_pos(cur_move.new_pos, dir)
|
|
||||||
.and_then(|new_pos| {
|
|
||||||
Some(Move {
|
|
||||||
new_pos,
|
|
||||||
dir,
|
|
||||||
consecutive: if cur_move.dir == dir {
|
|
||||||
cur_move.consecutive + 1
|
|
||||||
} else {
|
|
||||||
1
|
|
||||||
},
|
|
||||||
weight: cur_move.weight + self.map.map[new_pos.1][new_pos.0],
|
|
||||||
})
|
|
||||||
})
|
|
||||||
.filter(|m| m.consecutive != 4 && *m.dir != cur_move.dir.opposite())
|
|
||||||
.filter(|m| {
|
|
||||||
m.weight
|
|
||||||
< *self.cost_from[m.new_pos.1][m.new_pos.0]
|
|
||||||
.get(&(*m.dir, m.consecutive))
|
|
||||||
.unwrap_or(&u64::MAX)
|
|
||||||
})
|
|
||||||
}); // valid positions
|
|
||||||
// println!("valid moves with {:?}", cur_move);
|
|
||||||
for next_move in valid_moves {
|
|
||||||
// println!(" {:?}", next_move);
|
|
||||||
unvisited_next_moves.push(next_move);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
fn shortest_path_to(&self, to: Position) -> Vec<(Position, Direction)> {
|
|
||||||
let mut path = Vec::new();
|
|
||||||
let mut cur_pos = to;
|
|
||||||
// start at the end, walk backwards
|
|
||||||
while cur_pos != self.start {
|
|
||||||
let dir = self.dir_to.get(&cur_pos).unwrap();
|
|
||||||
path.push((cur_pos, *dir));
|
|
||||||
cur_pos = self.map.offset_pos(cur_pos, &dir.opposite()).unwrap();
|
|
||||||
}
|
|
||||||
path
|
|
||||||
}
|
|
||||||
fn print_shortest_path(&self, to: Position) {
|
|
||||||
let path = self.shortest_path_to(to);
|
|
||||||
let map: HashMap<_, _, RandomState> = HashMap::from_iter(path.into_iter());
|
|
||||||
// for y in 0..self.cost_to.len() {
|
|
||||||
// for x in 0..self.map.map[y].len() {
|
|
||||||
// if let Some(to_dir) = map.get(&(x, y)) {
|
|
||||||
// let c = match to_dir {
|
|
||||||
// Direction::Left => '<',
|
|
||||||
// Direction::Right => '>',
|
|
||||||
// Direction::Up => '^',
|
|
||||||
// Direction::Down => 'v',
|
|
||||||
// };
|
|
||||||
// print!("{}", c);
|
|
||||||
// } else {
|
|
||||||
// print!("{}", self.map.map[y][x]);
|
|
||||||
// }
|
|
||||||
// }
|
|
||||||
// println!();
|
|
||||||
// }
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
struct WalkCost2<'a> {
|
|
||||||
start: Position,
|
|
||||||
cost_from: Vec<Vec<HashMap<(Direction, usize), u64>>>,
|
|
||||||
map: &'a CityMap,
|
|
||||||
}
|
|
||||||
|
|
||||||
impl<'a> WalkCost2<'a> {
|
|
||||||
fn from_map(map: &'a CityMap, start: Position) -> Self {
|
|
||||||
Self {
|
|
||||||
map,
|
|
||||||
start,
|
|
||||||
cost_from: map
|
|
||||||
.map
|
|
||||||
.iter()
|
|
||||||
.map(|row| repeat(HashMap::new()).take(row.len()).collect())
|
|
||||||
.collect(),
|
|
||||||
}
|
|
||||||
}
|
|
||||||
fn compute(&mut self, to: Position) {
|
|
||||||
println!("computing to: {:?}", to);
|
|
||||||
let mut unvisited_next_moves: BinaryHeap<Move> = BinaryHeap::new();
|
|
||||||
let valid_start_moves: Vec<Move> = Direction::all()
|
|
||||||
.iter()
|
|
||||||
.filter_map(|dir| {
|
|
||||||
self.map.offset_pos(self.start, dir).and_then(|pos| {
|
|
||||||
Some(Move {
|
|
||||||
new_pos: pos,
|
|
||||||
dir,
|
|
||||||
consecutive: 1,
|
|
||||||
weight: self.map.map[pos.1][pos.0],
|
|
||||||
})
|
|
||||||
})
|
|
||||||
}) // valid positions
|
|
||||||
.collect();
|
|
||||||
|
|
||||||
for m in valid_start_moves {
|
|
||||||
unvisited_next_moves.push(m);
|
|
||||||
}
|
|
||||||
|
|
||||||
while let Some(cur_move) = unvisited_next_moves.pop() {
|
|
||||||
// we've been here already at a lower cost
|
|
||||||
// if cur_move.weight >= self.cost_to[cur_move.new_pos.1][cur_move.new_pos.0] {
|
|
||||||
// continue;
|
|
||||||
// }
|
|
||||||
if let Some(last_weight) = self.cost_from[cur_move.new_pos.1][cur_move.new_pos.0]
|
|
||||||
.get(&(*cur_move.dir, cur_move.consecutive))
|
|
||||||
{
|
|
||||||
if cur_move.weight < *last_weight {
|
|
||||||
self.cost_from[cur_move.new_pos.1][cur_move.new_pos.0]
|
|
||||||
.insert((*cur_move.dir, cur_move.consecutive), cur_move.weight);
|
|
||||||
// println!("move {:?} inserted {:?}", cur_move, (*cur_move.dir, cur_move.consecutive));
|
|
||||||
} else {
|
|
||||||
continue;
|
|
||||||
} // visited before at lower cost }
|
|
||||||
} else {
|
|
||||||
// println!("move {:?} inserted {:?}", cur_move, (*cur_move.dir, cur_move.consecutive));
|
|
||||||
self.cost_from[cur_move.new_pos.1][cur_move.new_pos.0]
|
|
||||||
.insert((*cur_move.dir, cur_move.consecutive), cur_move.weight);
|
|
||||||
}
|
|
||||||
|
|
||||||
if cur_move.new_pos == to {
|
|
||||||
// println!("reached end pos {:?} via {:?}", to, cur_move);
|
|
||||||
continue;
|
|
||||||
}
|
|
||||||
let valid_moves = Direction::all().iter().filter_map(|dir| {
|
|
||||||
self.map
|
|
||||||
.offset_pos(cur_move.new_pos, dir)
|
|
||||||
.and_then(|new_pos| {
|
|
||||||
Some(Move {
|
|
||||||
new_pos,
|
|
||||||
dir,
|
|
||||||
consecutive: if cur_move.dir == dir {
|
|
||||||
cur_move.consecutive + 1
|
|
||||||
} else {
|
|
||||||
1
|
|
||||||
},
|
|
||||||
weight: cur_move.weight + self.map.map[new_pos.1][new_pos.0],
|
|
||||||
})
|
|
||||||
})
|
|
||||||
.filter(|m| *m.dir != cur_move.dir.opposite())
|
|
||||||
.filter(|m| {
|
|
||||||
if m.dir == cur_move.dir {
|
|
||||||
m.consecutive < 11
|
|
||||||
} else {
|
|
||||||
cur_move.consecutive >= 4
|
|
||||||
}
|
|
||||||
})
|
|
||||||
.filter(|m| m.new_pos != to || m.consecutive >= 4)
|
|
||||||
.filter(|m| {
|
|
||||||
m.weight
|
|
||||||
< *self.cost_from[m.new_pos.1][m.new_pos.0]
|
|
||||||
.get(&(*m.dir, m.consecutive))
|
|
||||||
.unwrap_or(&u64::MAX)
|
|
||||||
})
|
|
||||||
}); // valid positions
|
|
||||||
// println!("valid moves with {:?}", cur_move);
|
|
||||||
for next_move in valid_moves {
|
|
||||||
// println!(" {:?}", next_move);
|
|
||||||
unvisited_next_moves.push(next_move);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
|
|
||||||
fn shortest_path_to(&self, to: Position) -> Vec<(Position, Direction)> {
|
|
||||||
let mut path = Vec::new();
|
|
||||||
let mut cur_pos = to;
|
|
||||||
// start at the end, walk backwards
|
|
||||||
while cur_pos != self.start {
|
|
||||||
let (m, val) = self.cost_from[cur_pos.1][cur_pos.0].iter().min_by(|a, b| a.1.cmp(b.1)).unwrap();
|
|
||||||
path.push((cur_pos, m.0));
|
|
||||||
cur_pos = self.map.offset_pos(cur_pos, &m.0.opposite()).unwrap();
|
|
||||||
}
|
|
||||||
path
|
|
||||||
}
|
|
||||||
fn print_shortest_path(&self, to: Position) {
|
|
||||||
let path = self.shortest_path_to(to);
|
|
||||||
let map: HashMap<_, _, RandomState> = HashMap::from_iter(path.into_iter());
|
|
||||||
for y in 0..self.cost_from.len() {
|
|
||||||
for x in 0..self.map.map[y].len() {
|
|
||||||
if let Some(to_dir) = map.get(&(x, y)) {
|
|
||||||
let c = match to_dir {
|
|
||||||
Direction::Left => '<',
|
|
||||||
Direction::Right => '>',
|
|
||||||
Direction::Up => '^',
|
|
||||||
Direction::Down => 'v',
|
|
||||||
};
|
|
||||||
print!("{}", c);
|
|
||||||
} else {
|
|
||||||
print!("{}", self.map.map[y][x]);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
println!();
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
impl<T: BufRead> From<Lines<T>> for CityMap {
|
|
||||||
fn from(lines: Lines<T>) -> Self {
|
|
||||||
Self {
|
|
||||||
map: lines
|
|
||||||
.map(|l| l.unwrap().chars().map(|c| c as u64 - '0' as u64).collect())
|
|
||||||
.collect(),
|
|
||||||
}
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
// PROBLEM 1 solution
|
|
||||||
|
|
||||||
fn problem1<T: BufRead>(input: Lines<T>) -> u64 {
|
|
||||||
let map = CityMap::from(input);
|
|
||||||
let mut costs = WalkCost::from_map(&map, (0, 0));
|
|
||||||
costs.compute();
|
|
||||||
|
|
||||||
// println!("{}", costs);
|
|
||||||
// costs.print_shortest_path((costs.cost_to[0].len() - 1, costs.cost_to.len() - 1));
|
|
||||||
|
|
||||||
*costs.cost_from[costs.cost_from.len() - 1][costs.cost_from[0].len() - 1]
|
|
||||||
.values()
|
|
||||||
.min()
|
|
||||||
.unwrap()
|
|
||||||
}
|
|
||||||
|
|
||||||
// PROBLEM 2 solution
|
|
||||||
fn problem2<T: BufRead>(input: Lines<T>) -> u64 {
|
|
||||||
let map = CityMap::from(input);
|
|
||||||
let mut costs = WalkCost2::from_map(&map, (0, 0));
|
|
||||||
costs.compute((map.map[0].len() - 1, map.map.len() - 1));
|
|
||||||
|
|
||||||
// println!("{}", costs);
|
|
||||||
costs.print_shortest_path((costs.cost_from[0].len() - 1, costs.cost_from.len() - 1));
|
|
||||||
|
|
||||||
*costs.cost_from[costs.cost_from.len() - 1][costs.cost_from[0].len() - 1]
|
|
||||||
.values()
|
|
||||||
.min()
|
|
||||||
.unwrap()
|
|
||||||
}
|
|
||||||
|
|
||||||
#[cfg(test)]
|
|
||||||
mod tests {
|
|
||||||
use crate::*;
|
|
||||||
use std::io::Cursor;
|
|
||||||
use test_case::test_case;
|
|
||||||
|
|
||||||
const EXAMPLE: &str = &"2413432311323
|
|
||||||
3215453535623
|
|
||||||
3255245654254
|
|
||||||
3446585845452
|
|
||||||
4546657867536
|
|
||||||
1438598798454
|
|
||||||
4457876987766
|
|
||||||
3637877979653
|
|
||||||
4654967986887
|
|
||||||
4564679986453
|
|
||||||
1224686865563
|
|
||||||
2546548887735
|
|
||||||
4322674655533";
|
|
||||||
|
|
||||||
const EXAMPLE2: &str = &"111111111111
|
|
||||||
999999999991
|
|
||||||
999999999991
|
|
||||||
999999999991
|
|
||||||
999999999991";
|
|
||||||
|
|
||||||
#[test]
|
|
||||||
fn problem1_example() {
|
|
||||||
let c = Cursor::new(EXAMPLE);
|
|
||||||
assert_eq!(problem1(c.lines()), 102);
|
|
||||||
}
|
|
||||||
|
|
||||||
#[test_case(EXAMPLE, 94)]
|
|
||||||
#[test_case(EXAMPLE2, 71)]
|
|
||||||
fn problem2_example(example: &str, expect: u64) {
|
|
||||||
let c = Cursor::new(example);
|
|
||||||
assert_eq!(problem2(c.lines()), expect);
|
|
||||||
}
|
|
||||||
}
|
|
||||||
Loading…
Reference in New Issue
Block a user