mirror of
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49 lines
1.4 KiB
JavaScript
49 lines
1.4 KiB
JavaScript
async function computeMST(tomlStr) {
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const [{ parse }, { Heap }, { default: table }] = await Promise.all([
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import("https://cdn.skypack.dev/smol-toml"),
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import("https://cdn.skypack.dev/mnemonist/heap"),
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import("https://cdn.skypack.dev/text-table")
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]);
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const { edges } = parse(tomlStr), nodes = new Set();
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const heap = new Heap((a, b) => a.weight - b.weight);
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edges.forEach(e => {
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heap.push(e);
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nodes.add(e.from);
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nodes.add(e.to);
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});
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const parent = new Map(), rank = new Map();
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nodes.forEach(n => parent.set(n, n) || rank.set(n, 0));
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const find = i => {
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while (parent.get(i) !== i) {
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parent.set(i, parent.get(parent.get(i)));
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i = parent.get(i);
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}
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return i;
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};
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const mst = [['From', 'To', 'Weight']], nCount = nodes.size;
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let totalWeight = 0;
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while (heap.size() > 0 && mst.length < nCount) {
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const { from, to, weight } = heap.pop();
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let rootU = find(from), rootV = find(to);
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if (rootU !== rootV) {
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if (rank.get(rootU) < rank.get(rootV)) [rootU, rootV] = [rootV, rootU];
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parent.set(rootV, rootU);
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if (rank.get(rootU) === rank.get(rootV)) rank.set(rootU, rank.get(rootU) + 1);
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mst.push([from, to, String(weight)]);
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totalWeight += weight;
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}
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}
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return { table: table(mst), totalWeight };
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}
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export default computeMST;
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// Generation time: 2.142s
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// Result: FAIL
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