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22 lines
758 B
JavaScript
22 lines
758 B
JavaScript
async function findConvexHull(a) {
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const { sortBy, uniqWith, isEqual } = await import('https://cdn.jsdelivr.net/npm/lodash-es@4.17.21/lodash.js');
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a = uniqWith(a, isEqual);
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if (a.length < 4) return a;
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const b = sortBy(a, [v => v.x, v => v.y]);
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const c = (o, p, q) => (p.x - o.x) * (q.y - o.y) - (p.y - o.y) * (q.x - o.x);
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const d = [];
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for (const p of b) {
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while (d.length > 1 && c(d[d.length - 2], d[d.length - 1], p) <= 0) d.pop();
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d.push(p);
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}
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const e = [];
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for (let i = b.length; i--;) {
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const p = b[i];
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while (e.length > 1 && c(e[e.length - 2], e[e.length - 1], p) <= 0) e.pop();
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e.push(p);
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}
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return uniqWith([...d, ...e], isEqual);
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}
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export default findConvexHull;
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// Generation time: 16.314s
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// Result: PASS
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