From db212d5bdadcd918ad1bf7f882ac39f35cfcbe6e Mon Sep 17 00:00:00 2001 From: tristan Date: Tue, 10 Dec 2024 06:55:00 +0000 Subject: [PATCH] 2024 day 10 part 1 in javascript --- 2024/10/example.txt | 8 +++++++ 2024/10/input.txt | 58 +++++++++++++++++++++++++++++++++++++++++++++ 2024/10/solution.js | 55 ++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 121 insertions(+) create mode 100644 2024/10/example.txt create mode 100644 2024/10/input.txt create mode 100644 2024/10/solution.js diff --git a/2024/10/example.txt b/2024/10/example.txt new file mode 100644 index 0000000..cada9b3 --- /dev/null +++ b/2024/10/example.txt @@ -0,0 +1,8 @@ +89010123 +78121874 +87430965 +96549874 +45678903 +32019012 +01329801 +10456732 diff --git a/2024/10/input.txt b/2024/10/input.txt new file mode 100644 index 0000000..452a4bc --- /dev/null +++ b/2024/10/input.txt @@ -0,0 +1,58 @@ +5678970120787667809876787651450321789810165432234561012345 +4301787431296556912765698540341410786728765501103676545434 +3212896594365443213454501231232545695439154610898387656946 +4307885785872337801653215432545694321089043781763296047877 +5456934576901236998740126721694787899676112891054102137898 +4327825676210365485035432830780146788765208982567873223703 +1012010789301345304126701910567235623654367643432984012612 +9887652105401253213239878323458945514545106543221265698543 +6798943766798760560145569850179876408763215456100896787432 +5212237854899621056776457763287654309854580367018701656501 +4302108983014552345889308954390101218345691278929632540987 +8921321212123467496973217654321010101210782987834541231236 +7010450908765658787210106563898110567623458906543210340145 +6524567849434349872323293478967223408988967217890107459054 +5433008956721238721494782566554310510177654394345498768765 +8942112349810101430585691057431214321287656783216321659056 +9853523658901233549674541008120109450392345654307010123141 +6765434567890312678234432219078218765431874309458927034230 +1034323450765403510165498348569341016210967218567898985541 +4125614321877654523276327653414452547893458967898769876632 +3210701234988347678987014512103963458982105450745601896781 +4678890215679298689898101105432878967821123301234312765890 +5469810309100198776543239416001263456710054210126543454323 +6954323458210789743987678327122452349821269329237632670110 +7856542167345679812310565498214301265430178778748911789224 +3067630018901256701423457012303210178923476565652100654343 +2188921078872345690501298989452121089012383418983434334534 +3298934569863418987632367898763011298234592307894521025676 +0387650101678507876753456501014980347105681016765601210787 +1456343212589216909865401432325671256501789823454782309898 +2341067823410365419872316543234560787432328987123495434321 +8932058934321474321891027652101765698543212656016596521030 +7634149965430589890765438984989854321692303443067787676543 +4543232876787672763210567823870143430781054512198971980612 +4687601045298101454569498014561034231278766503456890121701 +3894523432101212343278307601432120140389107652107765439890 +2183410589043239852101212587347899655473298940998987610141 +1012398679650126760120103496256978796554567831876898543234 +0310487778743245679833210145107878987143278722365687650125 +1223456899012632988744103230123217610012189013451232105676 +8346543456598701279655654389874306526323076567600345694789 +9857812347405654210346969210165435435414105458912256783238 +6768901098312343981237878301456521056905912345863109890104 +0345650101232107834369765412347678167876801056874223454323 +1278761321943456125078098943678999101210760767985214567910 +2109874430854534076165107834567783212323458898876307698876 +3436543561763325689234256623478654323212789954343298714565 +4567612675610118763240345510569823434101652765210134503443 +5698203984323709454121245432234712345612501897898325612652 +6782100112345890365039876101165601016780432101107210726761 +6783078201076761276321276543036523239891569232216874835890 +5894569345987457889430389236543210145652678740125965934701 +6784578896590356996321298107012301276743245656734014821012 +5693678787101243987654301058905434985890130543876523498763 +4542109843262012276019012765676125673981021982923434549854 +3432101257876540145328943894387089012832123671019323676345 +4309210369901234239457654703298976326721034501208710789234 +3218765478710123378765645612107845435434345212345621678101 diff --git a/2024/10/solution.js b/2024/10/solution.js new file mode 100644 index 0000000..afaca02 --- /dev/null +++ b/2024/10/solution.js @@ -0,0 +1,55 @@ + +const input = (await Bun.file("input.txt").text()).trim() + +const rows = [[]]; + +const trailheads = []; + +for (let i = 0, x = 0, y = 0; i < input.length; i++) { + if (input[i] == "\n") { + rows.push([]); + y++; + x = 0; + continue; + } + const alt = parseInt(input[i]); + rows[y].push(alt); + if (alt == 0) { + trailheads.push({x,y}) + } + x++; +} + +const summitChart = Array.from({length: rows.length}, () => Array.from({length: rows.length}, () => (new Set()))) + +function findSummits({x, y}) { + if (summitChart[y][x].size > 0) { + return summitChart[y][x] + } + if (rows[y][x] == 9) { + summitChart[y][x].add(x + y * rows.length) + return summitChart[y][x] + } + if (x != 0 && rows[y][x-1] - rows[y][x] == 1) { + summitChart[y][x] = summitChart[y][x].union(findSummits({y, x: x - 1})) + } + if (x != rows.length - 1 && rows[y][x+1] - rows[y][x] == 1) { + summitChart[y][x] = summitChart[y][x].union(findSummits({y, x: x + 1})) + } + if (y != 0 && rows[y-1][x] - rows[y][x] == 1) { + summitChart[y][x] = summitChart[y][x].union(findSummits({y: y-1, x})) + } + if (y != rows.length - 1 && rows[y+1][x] - rows[y][x] == 1) { + summitChart[y][x] = summitChart[y][x].union(findSummits({y: y+1, x})) + } + return summitChart[y][x] +} + +let sum = 0; +for (const trailhead of trailheads) { + const summits = findSummits(trailhead) + sum += summits.size +} + +console.log(sum) +