commit bc42c17bf8ef8ed5df99d35a955a94a5b4ca28eb · dunkirk.sh/aoc-2025

-1

index.ts

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       console.log("Hello via Bun!");

shared/02/input.txt

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       26803-38596,161-351,37-56,9945663-10044587,350019-413817,5252508299-5252534634,38145069-38162596,1747127-1881019,609816-640411,207466-230638,18904-25781,131637-190261,438347308-438525264,5124157617-5124298820,68670991-68710448,8282798062-8282867198,2942-5251,659813-676399,57-99,5857600742-5857691960,9898925025-9899040061,745821-835116,2056-2782,686588904-686792094,5487438-5622255,325224-347154,352-630,244657-315699,459409-500499,639-918,78943-106934,3260856-3442902,3-20,887467-1022885,975-1863,5897-13354,43667065-43786338

+58

ts/02/index.ts

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       const file = await Bun.file("../../shared/02/input.txt").text();

     

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       const ranges: { start: number; end: number }[] = file

     

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       	.split(",")

     

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       	.map((range) => {

     

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       		const splitRange = range.split("-");

     

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       		return {

     

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       			start: Number.parseInt(splitRange[0] as string, 10),

     

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       			end: Number.parseInt(splitRange[1] as string, 10),

     

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       		};

     

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       	});

     

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       (() => {

     

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       	let count = 0;

     

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       	ranges.forEach((range) => {

     

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       		for (let i = range.start; i <= range.end; i++) {

     

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       			const numberString = i.toString();

     

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       			if (numberString.length % 2 === 1) continue;

     

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       			const firstHalf = numberString.substring(

     

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       				0,

     

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       				(numberString.length + 1) / 2,

     

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       			);

     

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       			const secondHalf = numberString.substring(numberString.length / 2);

     

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       			if (firstHalf === secondHalf) count += i;

     

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       		}

     

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       	});

     

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       	console.log("part 1:", count);

     

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       })();

     

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       (() => {

     

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       	let count = 0;

     

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       	ranges.forEach((range) => {

     

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       		for (let i = range.start; i <= range.end; i++) {

     

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       			const numberString = i.toString();

     

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       			for (let j = 1; j <= Math.floor(numberString.length / 2); j++) {

     

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       				if (numberString.length % j !== 0) continue;

     

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       				const chunk = numberString.slice(0, j);

     

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       				let testString = "";

     

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       				for (let k = 0; k < numberString.length / j; k++) testString += chunk;

     

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       				if (testString === numberString) {

     

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       					count += i;

     

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       					break;

     

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       				}

     

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       			}

     

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       		}

     

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       	});

     

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       	console.log("part 2:", count);

     

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       })();