28 lines
728 B
JavaScript
28 lines
728 B
JavaScript
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import fp from "lodash/fp.js";
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import _ from "lodash";
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import u from "updeep";
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import { toDecimal } from "./part1.mjs";
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function findNumber(entries, index, most) {
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// which number to filter on
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const mostSeen =
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_.sum(entries.map((e) => e[index])) * 2 >= entries.length ? 1 : 0;
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const filter = most ? mostSeen : 1 - mostSeen;
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const filtered = entries.filter((e) => e[index] === filter);
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if (filtered.length === 1) return filtered[0];
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return findNumber(filtered, index + 1, most);
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}
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export const solution = (entries) => {
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const oxyGenerator = toDecimal(findNumber(entries, 0, true));
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const scrubber = toDecimal(findNumber(entries, 0, false));
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return oxyGenerator * scrubber;
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};
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