27 lines
923 B
TypeScript
27 lines
923 B
TypeScript
export async function solve() {
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const [rules, pages] = await Deno.readTextFile("./input.txt")
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.then(i => i
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.split("\n\n")
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).then(([rules, pages]) => [
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rules.split("\n").map(e => e.split("|") as [string, string]),
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pages.split("\n").map(e => e.split(","))
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] as const);
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let sum = 0;
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for (const pageGroup of pages) {
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let valid = true;
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for (let i = 1; i < pageGroup.length; i++) {
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const matchingRules = rules.filter(([before, _]) => before == pageGroup[i]).filter(
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([before, _]) => before == pageGroup[i]
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).map(([_, after]) => after);
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if (matchingRules.some(after => pageGroup.slice(0, i).includes(after))) {
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valid = false;
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break
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}
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}
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if (valid) sum += +pageGroup[Math.floor(pageGroup.length / 2)];
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}
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return sum
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}
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