Day 3: Part 1
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<!DOCTYPE html>
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<html lang="en-us">
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<head>
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<meta charset="utf-8"/>
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<title>Day 3 - Advent of Code 2025</title>
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<script>window.addEventListener('click', function(e,s,r){if(e.target.nodeName==='CODE'&&e.detail===3){s=window.getSelection();s.removeAllRanges();r=document.createRange();r.selectNodeContents(e.target);s.addRange(r);}});</script>
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</head><!--
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Oh, hello! Funny seeing you here.
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I appreciate your enthusiasm, but you aren't going to find much down here.
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There certainly aren't clues to any of the puzzles. The best surprises don't
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even appear in the source until you unlock them for real.
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Please be careful with automated requests; I'm not a massive company, and I can
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only take so much traffic. Please be considerate so that everyone gets to play.
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If you're curious about how Advent of Code works, it's running on some custom
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Perl code. Other than a few integrations (auth, analytics, social media), I
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built the whole thing myself, including the design, animations, prose, and all
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of the puzzles.
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The puzzles are most of the work; preparing a new calendar and a new set of
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puzzles takes all of my free time for months every year. A lot of effort went
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into building this thing - I hope you're enjoying playing it as much as I
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enjoyed making it for you!
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If you'd like to hang out, I'm @was.tl on Bluesky and @ericwastl@hachyderm.io
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on Mastodon.
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- Eric Wastl
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-->
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<body>
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<header><div><h1 class="title-global"><a href="/">Advent of Code</a></h1><nav><ul><li><a href="/2025/about">[About]</a></li><li><a href="/2025/events">[Events]</a></li><li><a href="https://cottonbureau.com/people/advent-of-code" target="_blank">[Shop]</a></li><li><a href="/2025/auth/login">[Log In]</a></li></ul></nav></div><div><h1 class="title-event"> <span class="title-event-wrap">0x0000|</span><a href="/2025">2025</a><span class="title-event-wrap"></span></h1><nav><ul><li><a href="/2025">[Calendar]</a></li><li><a href="/2025/support">[AoC++]</a></li><li><a href="/2025/sponsors">[Sponsors]</a></li><li><a href="/2025/leaderboard/private">[Leaderboards]</a></li><li><a href="/2025/stats">[Stats]</a></li></ul></nav></div></header>
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<div id="sidebar">
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<div id="sponsor"><div class="quiet">Our <a href="/2025/sponsors">sponsors</a> help make Advent of Code possible:</div><div class="sponsor"><a href="/2025/sponsors/redirect?url=https%3A%2F%2Fcareers%2Ecisco%2Ecom%2Fglobal%2Fen%2Fsplunk" target="_blank" onclick="if(ga)ga('send','event','sponsor','sidebar',this.href);" rel="noopener">Splunk, a Cisco Company</a> - Come build a more resilient digital world with us.</div></div>
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</div><!--/sidebar-->
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<main>
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<article class="day-desc"><h2>--- Day 3: Lobby ---</h2><p>You descend a short staircase, enter the surprisingly vast lobby, and are quickly cleared by the security checkpoint. When you get to the main elevators, however, you discover that each one has a red light above it: they're all <em>offline</em>.</p>
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<p>"Sorry about that," an Elf apologizes as she tinkers with a nearby control panel. "Some kind of electrical surge seems to have fried them. I'll try to get them online soon."</p>
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<p>You explain your need to get further underground. "Well, you could at least take the escalator down to the printing department, not that you'd get much further than that without the elevators working. That is, you could if the escalator weren't also <span title="Escalator temporarily stairs. Sorry for the convenience.">offline</span>."</p>
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<p>"But, don't worry! It's not fried; it just needs power. Maybe you can get it running while I keep working on the elevators."</p>
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<p>There are batteries nearby that can supply emergency power to the escalator for just such an occasion. The batteries are each labeled with their <a href="/2020/day/10">joltage</a> rating, a value from <code>1</code> to <code>9</code>. You make a note of their joltage ratings (your puzzle input). For example:</p>
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<pre><code>987654321111111
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811111111111119
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234234234234278
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818181911112111
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</code></pre>
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<p>The batteries are arranged into <em>banks</em>; each line of digits in your input corresponds to a single bank of batteries. Within each bank, you need to turn on <em>exactly two</em> batteries; the joltage that the bank produces is equal to the number formed by the digits on the batteries you've turned on. For example, if you have a bank like <code>12345</code> and you turn on batteries <code>2</code> and <code>4</code>, the bank would produce <code>24</code> jolts. (You cannot rearrange batteries.)</p>
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<p>You'll need to find the largest possible joltage each bank can produce. In the above example:</p>
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<ul>
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<li>In <code><em>98</em>7654321111111</code>, you can make the largest joltage possible, <em><code>98</code></em>, by turning on the first two batteries.</li>
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<li>In <code><em>8</em>1111111111111<em>9</em></code>, you can make the largest joltage possible by turning on the batteries labeled <code>8</code> and <code>9</code>, producing <em><code>89</code></em> jolts.</li>
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<li>In <code>2342342342342<em>78</em></code>, you can make <em><code>78</code></em> by turning on the last two batteries (marked <code>7</code> and <code>8</code>).</li>
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<li>In <code>818181<em>9</em>1111<em>2</em>111</code>, the largest joltage you can produce is <em><code>92</code></em>.</li>
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</ul>
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<p>The total output joltage is the sum of the maximum joltage from each bank, so in this example, the total output joltage is <code>98</code> + <code>89</code> + <code>78</code> + <code>92</code> = <code><em>357</em></code>.</p>
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<p>There are many batteries in front of you. Find the maximum joltage possible from each bank; <em>what is the total output joltage?</em></p>
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</article>
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<p>To play, please identify yourself via one of these services:</p>
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<p><a href="/auth/github">[GitHub]</a> <a href="/auth/google">[Google]</a> <a href="/auth/twitter">[Twitter]</a> <a href="/auth/reddit">[Reddit]</a> <span class="quiet">- <a href="/2025/about#faq_auth">[How Does Auth Work?]</a></span></p>
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200
day3/input.txt
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day3/input.txt
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2221222621311222213132242151213242132162234231144212112222231222222222122221122241223232322424322112
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3543326422247421243461523246251225253652324623123514155262436222322736212622632535261512337153224225
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3222222314222211221232222212222122123212133222228331212211323332221223322223222121221222222212212121
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3224323622236944523235623633582354553243243425462556164564534655532214442234136726342452535235224521
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4463242484324251544436315213253238423242742225441254332255425532344624856246285453554421653275554443
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1762275124723427566439132222317332742546725316626264621222632333535422163371658522235287684667354262
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2222222221222221232222112243222162222223522222122121222122222115212222122222122224212118122121222222
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3322322221222122211222222252222212222225222221222232223212222222282212121222222341232222212212222222
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3343333332343443143333532233431521333135333233333533334333333234333234432322333333433533231132133333
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3785386723323225658553324532773545325523435172363575426333259433323353692363343253334939352343729333
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2327232424563359226332921323443284252244243833232432422333336527672222829333232223333163323346633653
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2212323132222222223112122221222231122212231223332221222222221122222212222213212222163213222222222222
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5223524923233333338356152351323242822352333235433232243233232333325533234225573313332225243333922133
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3331331433233422332423432433333333322545214213352323353233335343332343422233233533223332226251221333
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2235352232253522322225222552151722521253143424221542442352284223225322654252162443651155422245323373
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3517334233325372353311423123212243323323732622323113322241323222212612235135335163262311544322323363
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2224314121322213213313122212222434222612212212222223123241222314141222432432227222212272222222122222
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2342122233222233251122222231121128213223222222222212222232223232212222122222222232222222232222312323
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3232324214323133352311226332245322333624232342346455344922232233343433244343533322245216222322262232
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3544535322322352143324422212432253424321533463343524133351214153322431522522333423452133222143541224
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2628223222122262123321222312422222222322241212222422222322222224342221222121221321222222222622132132
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5535556552545545555555557645555464534554443854485557595644285535455855549533534558583443445524545545
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2244541422254354225522153243223254334222222222312211244332232221254233333212412223352154323512222323
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5236456254564453255452445446343365546543567644427446464434244434264463496356533366346544534644526426
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3572224343444323333333342633343534323337232433324334563333343241436333435343332323334332442514233335
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6256322274413722223125432244223243125142522926423354633412262415421543522551225211623514224522451235
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3323633243222133114233334223232323322125552432332333333234213223743235333233322323322332332433233333
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3125424642442232617562273753473623364534315321621542223342142324115535682882241283322222122248272423
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7228433313232643336621532253343627353421632223343332323331143111227332363472322322331533633732234223
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2222232522222624334325262222332223262422422312365363432322532423125223121216222223265222326234223366
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5234331314343232434335353333435125523333441233342442332332313532445233352333321533335233233233443453
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4242223553122225222241223312225224322322252472313421222122223313232222322221222323224213212423223222
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2222225222324122223212835332426222414226442126226524222242222253232222231222422223113526212221232122
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1422225322213321321212431222222522121123231212441235523522222322221426224434123212221422265352441222
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3444434424222122122134322243124422234143233552221122213212312343312123322224424334244223433422211232
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2451436664537546525513735566444554843334653353456624643635423656665541656437525543645434446453648546
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4631322252222223332732372324458532634623222373132533414342722633233384326222223225133233442333232223
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6324553232264554348322377776233355273732336433423375555494723333576225335433233433332243232332334433
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4311633322444322526522224231249748222332224123231247232463211436822233192245525224232232245232112222
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3453363332233223343334133235333333317443313853373743263363553512772335433344333422333333333364333434
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5421322232428343342432554412324246453522232223322152112413242233334127412117612183452217725228244352
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2242441353243435264326333252354134153925243347133463444444654422523256633346213552165265334346262334
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3242335463412545435542342455435434462225371414735284346244296426755243253343544533233225224592442542
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7175645488374551647875379848876595478385377735784336346554495185585165597366984896537679484837756718
|
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1142212623741651142733343133612642246226712223417762141434715666445534363164647145556331114533223389
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2553776554543453285443364652525547525442556455647521554555494455545553455575595653464435565525545745
|
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5221322223321213333123233133222222222113314223221332322532222223323234222332232233312432322323213222
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3122222252524321222212224423214242524221121422211222112221112426222252322222223224322242222222223242
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3223232233233332223133232232433443323715235231342433423334323233533323223414333335234236432432234332
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4675333343353333364435233435333332742347233352633225235735633253373443333233143333443322544343243334
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2364323563946282485252324242682245222531133832685444439324623525621652653435193544229628373393713543
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4332544423434343232354454415231355524453354232445331153256324435556872254374212524244434224453415454
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2232252142823332136541112223345252324123825322322643134952454223681222222662424524313463763232446876
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4369885952776849757844783687586499846598215774661698436866478693597877366358634462858778999754679986
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5353455553262776125556256636332536646424554253237322235541333542733323536855564433653542464573425364
|
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4323233374674274525523434512317334455432333363235473575425653545533732554324223533442645624357366363
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3121522224252541351242224222233234222211422321225222524281222242222322223112223222222155134225222522
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6333123342622434222323633412224421143522144422142532243312221343253122142422323226223232335323133323
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2524223122322446222621134114322233222714228223332422241722422222232322256122223223342234122422124234
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7737561969765366875564966493886555557856587235985467465866799748684765748357934865344669787383932445
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3123622322343323232673421232421212233236232326142121332234227542143221262222211234123433331234113222
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2342422332413422223223217233332421222321222222242341424122222322122323222322241132321735432432212132
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6232322232212272295229124522232226322215222125212311822262212522211715227232122353432312222223212342
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2724552623672452422782286624111221123452622835342523132225612433652422324345264242464652266222615567
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5486637886339537333447455465774454454364677367632364487724468785739863845348435365335583386933646576
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1333222332153222233211335733343351375626126352323726253273352232245322355344222655826252372733422333
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2234522214343233922253234243443242322321225221426446424226432544141532282112142324253123423212263448
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4433344434534334343236323457334446344543444533344434343445143334464242374443475335336334933443443434
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2223121242321225212221132322141122221251212421222222226122122212235422222113123241212221223221115222
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2233133333134233543348533236418355832242435333138373636325343926433633548233216235317426323368444274
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4343863464338386564934454645535464455444385444638436663368515452346543164854345444266656455664354442
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2325133212433632125233335333335442333236313315333343663214343323313233232223342223322243225132323342
|
||||
2762597754633144143375642334644552845963369348224334338735534553337361233552443387335493534314426733
|
||||
5649447645764657856646535974786834457426656499746775543486436375943665495486618458538536755573755466
|
||||
2222222224222421548782737672834442426372242478712622428228223416922263434854352249158222192331124128
|
||||
3223222223162612222334222153253543232352212355323222512322233222311322231224227236223215423232222221
|
||||
3875333244768161552854545275843768383133163735226133156724236148153435652814578381435746452784414459
|
||||
2324321222322261223222125261412622121328723133121632252287212212222231432222221162282315411214213122
|
||||
2429827257586545121721222245129224224531541322212636222222262414411253546422239425845534522446265242
|
||||
3352233332244236442341233422437425333514343324339424343614414644532414243834693234452622546432244372
|
||||
2222221322223231321222221233112222222322223122232222222226321222322114212261121112113212212222123253
|
||||
5242456346121322263122622233322273322435227233274352334624322142133182253232221234232932322215224433
|
||||
6344734335323423343243333443844432646244233222342433421334324223444324114133433272484624212322633144
|
||||
3342233812332232222172323732365326323213232241122227322323225432332222645432432324325234275232222314
|
||||
9754256445423375544475434544276537523554535442434343454239345579934534133542242714655556855236554442
|
||||
2353533435245531553953557444345555655255543358353553554462626533565522565255335814425542546353594525
|
||||
2225244322313252522225212321324252121221123552622222132221222124241812142322562234155617332122414331
|
||||
5252267814225231242424254352345223443341434472444478244344232463251555424328328664219532126524514656
|
||||
2433635566363453144436352433336722436666246364367337633475557544465273346749464356863875573381332626
|
||||
5483787564533828687455355335347133682657766623453576852374472467651537865836447476363356463456534753
|
||||
5445354756252347373443737331333332435554435647565555175144244444342537162465544454446442222355244243
|
||||
1123335232252222243243213444233338421544282224323334411223223854313424223342232233433122924243342242
|
||||
3444323323333223222533324235333217227213623342283333333236133331335323232314243283323133383323322226
|
||||
4333233133323133333333333335342333244333233333333313433433343333225382432333293323334435332423333333
|
||||
6353453554554444544459553864854464543346445463754854445442536437453454445545324544454645445456353644
|
||||
4454545383447454844854255246848545445594453559544548955453254836435654544644854434479995344445448476
|
||||
3435254493343234452338423464623244524336363473523556325584464373333444333439315354636343242434238272
|
||||
3271473522122511432123544221266722722918223875322122213223724524222252414129298225628412122922124185
|
||||
8835486445354453364452758966485649744744959858754855444387449444799934547799445594444474444428599445
|
||||
6367434987327381438226232363337314255232254353133352223226953892333953223523235223735353263123533666
|
||||
3122312342212332136322112422123323333311212232224342444322232133433141422414533313233123233421314342
|
||||
2342123523222233725232269222222326223122213424532322331322142251372322222232212533325322392281431422
|
||||
2322634379214242475242442524545362125333325544432525252425226116235145452132332542553514855493425545
|
||||
4421523223223221212122262212322222212262333223223212322121122212222223222162222523221242223212223221
|
||||
7822126424242332172242245322662244322232512522416234625232423212324722442223274244249221257723211442
|
||||
3221224242252623224335111292732335547435524493922224128144222333122444222219244322532349322232423297
|
||||
2233421213222242222133113233122222221132222223321233222326332231512321322132324212312216562223215232
|
||||
2523641213453364232213431344354563323322424344153323413452533448263422422224736225232323442735434332
|
||||
3255992277439366547524452858476684863234767584665742565679564744834616336634656734254538546226946177
|
||||
3443453432354345224342333354435434443424442432445445337424335525455444435543345443544512344463664233
|
||||
8747776574254746383338575434566376665344455444685464445344463644544645548464654954737434646234566787
|
||||
2363514423363332532553524151452223324125125332235324228223312475242257622324515224354375425246323312
|
||||
2571354112533444126645214354434563422442643652323422335311476243243164424232422322454264327445441522
|
||||
5428828225132552621211242397337332391729433224261424963792332157242423377232123816228246331538133334
|
||||
2533221223232121322233222212242132122122352212422222321422321222232123213221223223122322223522212322
|
||||
2932228252752544473772522238422461322694545722242554218824237228223325525227362196711612252154252227
|
||||
5525252253363442223453255552322535552653454546524545332672434353445254591154453551423355355545152265
|
||||
3334233213224312333221214222242233332212342234232122322333242223323323342342231522232422212312223422
|
||||
1242473533442242264357662354144479625264464124423326435252515539724524542633327132134243232523346224
|
||||
2544463544436635863426544475666365775535746777467556365377251345455667777375966737835634353633774443
|
||||
4522533555554153546443933554546334444445355333745625525453435455461635453354345674446465563554545754
|
||||
2232244254334322442422223234334233321412441343442132532223224342534432333232324324322244414442343322
|
||||
3137233232422432483242322335224239242234432332334456221113251223353322429417123224234232234221334321
|
||||
1483263445432232533282433443333239443343333441339343244333253533363333435634433344433714373343432433
|
||||
3126716424422753242334374625312523634232436264427323452154262223443625245234122445445144521255232111
|
||||
4323343631427333223334333333462634363331333223353334332333322313373333332263443333327333326643332338
|
||||
2112222122222211233231121222122222322221232242222123312222113224222614222225113222233222222222322131
|
||||
2214222322323122311322221212212222221121211122122221241222222222222322224222112222213322222222223222
|
||||
6616343535656426221614126114424442323356341612336322453146126133261122554555115256252511166526161789
|
||||
2533422234222842243344573242222411353822222422225262121422212222232233731311272612252722622426512522
|
||||
7132238523245415263322425522421325225321442613222135422343451242342231543222221253243221423513335332
|
||||
6244844834844285337627373736442734333726222841435988667445655283427444634343858382234884188259145355
|
||||
1332212132122222122222222222132112222122122311221212222222222132212212224222322222222222221222622331
|
||||
3425425344333442637533464374333533355645532574733554432255325554632526452523634335346293544332245134
|
||||
4334295657434422555555455556554136542535235485653545465345536673555545555554445523453534433232575543
|
||||
3325454224335334523637654573511333464142442333463229434433523532335123333124342534533784253547434235
|
||||
2531723311234332223423323223322254132122625132334161323323343323233222133422313333342332213225223253
|
||||
2322322422332542224232132228212223222332214242242273213122342244432322233234122222222122233221233222
|
||||
7696589646767664667993653664566696673826669656465757646686556652566646655958874697666588797864655465
|
||||
1321312342222232244433322313132132322333322444354334142234242323332422424133222223343243321222223434
|
||||
7236622264272476234336644331445766626532732233672456536625443656253327436535643452432752472736354631
|
||||
2746732463444534354466326442385574732557554633365555535776726694774456256334423361775567469363576944
|
||||
4314324424323445343353432342252245245234323424323644575332235153126421434444234324441324442445414543
|
||||
3322232242534422642324852254363344252342327222227322352121541125142322252252328224332543442635457222
|
||||
2414762322421262472222223241323228223232231223324224212262223226224432151522324342444242223131242212
|
||||
3314243322232336272352332464142323334362362323524222413333126322616466545232332233244332323433625522
|
||||
2222123312243222351312322213241223221222212532352412312112323222221323282232223522312212212231211233
|
||||
2622253282232528877333532736522321882243632563332227452523813332333232223293692623752623322824742263
|
||||
3133334351336613413224234241142423233333234312543642442444333344425254253432423344242443433541542133
|
||||
2464642335545633346742347843755324535263326456363333634213435665423344533421974446263643477635453623
|
||||
3425433353133422322243332335222331224123233222533423233342542122322333122232221221343132355232442213
|
||||
6343464338545563465644313444734463333246443444544244345534442342664445435344443436434446414464653422
|
||||
3644243652744224242465233473341253253323354164457323424343524668252433386344242465543834683428483443
|
||||
2342213123221313324444331112311133413143444432411213231413234431343142344343231133343424133343156789
|
||||
4432422543443344754448335826324344143444322443344424125423242244245445253313543447434576834333254432
|
||||
4434464569262365465644146434563544644636445452445544226435445645554644654444343454634734764554366673
|
||||
2222212222223232222222112225221222221212222122222221422313232122131212112222241222122222222224221224
|
||||
4836723231625273286323224224221424523244234463542222332432637522232322263236482334421222344752242318
|
||||
3524226442211322523223252254224222155424422233222274232112253944421462152214522327323322452442433422
|
||||
5264423431423132232332244232634444213224361345223563462354435543233343144243212342461347244455233123
|
||||
4251765235423733322312264235241643417263775713125242521224124317242312215262222233134172712334312752
|
||||
2231522642123241933212223112222212321224113452432212242623222121122332237222243122212323232551332323
|
||||
3122332423322225345222222534622225632332132222223344225223521231422631222311222322214431252352422412
|
||||
6523312724324833738323313322744134722353822343325142334344634415232335812443337322322445124425436238
|
||||
3323533424333435612722335453334233567316335223335537233692343344443833235333321335521433243454522423
|
||||
3342425245212222124123223226222512292222314323222112512421222224221622323123222222224322322412224343
|
||||
7443444343454444432644544634834536333335243344253253344653337345453343334443464454334344334444347343
|
||||
3533483733345852637635155624427843851223435485741355333834234373272333243333234765562347364247353323
|
||||
3442442254325343246233332332363374163215235152566433223332243423132423422222513222231313233423453261
|
||||
1222211222222322212231622322213223312322112223232222221222252212212311232222222222221222222212231222
|
||||
2142222434232434121243332542123223723223112224242226322522244413135344225222222524323342132344242423
|
||||
2326223312442322222223324422423221321312324622224324372411422213322711212324224122323244223243322142
|
||||
4686646668674667656766966447686676676565576577586566276657656947865666565676837636659466657465667766
|
||||
2521827228312721421225124454242521512252222332232222242226112263122243221413223223221424321222222244
|
||||
2323331241233212133323227233121242222222122726343324142234242221823634222263322232223322432242243334
|
||||
1233318223444255434472644637233422336336412424363623253447431632444277334744421343233631466233334454
|
||||
3333323334223342433313333134242323323333432333344232334433234343224233333433333343334334332333333233
|
||||
28
main.py
Normal file
28
main.py
Normal file
@@ -0,0 +1,28 @@
|
||||
batteries = []
|
||||
|
||||
with open("day3/input.txt") as file:
|
||||
lines = file.readlines()
|
||||
for line in lines:
|
||||
line = line.strip("\n")
|
||||
data = []
|
||||
for joltage in line:
|
||||
data.append(int(joltage))
|
||||
batteries.append(data)
|
||||
|
||||
joltageSum = 0
|
||||
|
||||
for bank in batteries:
|
||||
tenthPlace = max(bank)
|
||||
onethPlace = 0
|
||||
indexOfMax = bank.index(tenthPlace)
|
||||
if(indexOfMax == len(bank)-1):
|
||||
onethPlace = tenthPlace
|
||||
tenthPlace = max(bank[:-1])
|
||||
else:
|
||||
onethPlace = max(bank[indexOfMax+1::])
|
||||
|
||||
joltageBank = int(f"{tenthPlace}{onethPlace}")
|
||||
print(f"Bank {batteries.index(bank)+1} joltage is {joltageBank}")
|
||||
joltageSum+=joltageBank
|
||||
|
||||
print(joltageSum)
|
||||
Reference in New Issue
Block a user