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17 lines
582 B
JavaScript
17 lines
582 B
JavaScript
const findConvexHull = async p => {
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const { uniqWith, isEqual, sortBy } = await import('https://esm.sh/lodash-es');
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const s = sortBy(uniqWith(p, isEqual), ['x', 'y']);
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if (s.length < 3) return s;
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const cw = (o, a, b) => (a.x - o.x) * (b.y - o.y) - (a.y - o.y) * (b.x - o.x) <= 0;
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const fn = a => a.reduce((h, pt) => {
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while (h.length > 1 && cw(h.at(-2), h.at(-1), pt)) h.pop();
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return h.push(pt), h;
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}, []);
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return [...fn(s).slice(0, -1), ...fn([...s].reverse()).slice(0, -1)];
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};
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export default findConvexHull;
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// Generation time: 39.797s
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// Result: PASS
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