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25 lines
759 B
JavaScript
25 lines
759 B
JavaScript
const findShortestPath = async (graph, start, end) => {
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const { default: PriorityQueue } = await import('https://cdn.jsdelivr.net/npm/js-priority-queue@0.1.5/+esm')
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const dists = new Map([[start, 0]])
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const pq = new PriorityQueue({ comparator: (a, b) => a.w - b.w })
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pq.queue({ n: start, w: 0 })
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while (pq.length) {
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const { n, w } = pq.dequeue()
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if (n === end) return w
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if (w > (dists.get(n) ?? 1 / 0)) continue
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for (const [neighbor, weight] of Object.entries(graph[n] || {})) {
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const newWeight = w + weight
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if (newWeight < (dists.get(neighbor) ?? 1 / 0)) {
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dists.set(neighbor, newWeight)
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pq.queue({ n: neighbor, w: newWeight })
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}
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}
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}
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return 1 / 0
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}
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export default findShortestPath; |