9 lines
206 B
JavaScript
9 lines
206 B
JavaScript
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import fp from "lodash/fp.js";
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export const solution = fp.flow([
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fp.groupBy(0),
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fp.mapValues(fp.map(fp.get(1))),
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fp.mapValues(fp.sum),
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({ forward, up, down }) => forward * (down - up),
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]);
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