{ "data": { "question": { "questionId": "1325", "questionFrontendId": "1514", "categoryTitle": "Algorithms", "boundTopicId": 325189, "title": "Path with Maximum Probability", "titleSlug": "path-with-maximum-probability", "content": "
You are given an undirected weighted graph of n nodes (0-indexed), represented by an edge list where edges[i] = [a, b] is an undirected edge connecting the nodes a and b with a probability of success of traversing that edge succProb[i].
Given two nodes start and end, find the path with the maximum probability of success to go from start to end and return its success probability.
If there is no path from start to end, return 0. Your answer will be accepted if it differs from the correct answer by at most 1e-5.
\n
Example 1:
\n\n
\nInput: n = 3, edges = [[0,1],[1,2],[0,2]], succProb = [0.5,0.5,0.2], start = 0, end = 2\nOutput: 0.25000\nExplanation: There are two paths from start to end, one having a probability of success = 0.2 and the other has 0.5 * 0.5 = 0.25.\n\n\n
Example 2:
\n\n
\nInput: n = 3, edges = [[0,1],[1,2],[0,2]], succProb = [0.5,0.5,0.3], start = 0, end = 2\nOutput: 0.30000\n\n\n
Example 3:
\n\n
\nInput: n = 3, edges = [[0,1]], succProb = [0.5], start = 0, end = 2\nOutput: 0.00000\nExplanation: There is no path between 0 and 2.\n\n\n
\n
Constraints:
\n\n2 <= n <= 10^40 <= start, end < nstart != end0 <= a, b < na != b0 <= succProb.length == edges.length <= 2*10^40 <= succProb[i] <= 1给你一个由 n 个节点(下标从 0 开始)组成的无向加权图,该图由一个描述边的列表组成,其中 edges[i] = [a, b] 表示连接节点 a 和 b 的一条无向边,且该边遍历成功的概率为 succProb[i] 。
指定两个节点分别作为起点 start 和终点 end ,请你找出从起点到终点成功概率最大的路径,并返回其成功概率。
如果不存在从 start 到 end 的路径,请 返回 0 。只要答案与标准答案的误差不超过 1e-5 ,就会被视作正确答案。
\n\n
示例 1:
\n\n
输入:n = 3, edges = [[0,1],[1,2],[0,2]], succProb = [0.5,0.5,0.2], start = 0, end = 2\n输出:0.25000\n解释:从起点到终点有两条路径,其中一条的成功概率为 0.2 ,而另一条为 0.5 * 0.5 = 0.25\n\n\n
示例 2:
\n\n
输入:n = 3, edges = [[0,1],[1,2],[0,2]], succProb = [0.5,0.5,0.3], start = 0, end = 2\n输出:0.30000\n\n\n
示例 3:
\n\n
输入:n = 3, edges = [[0,1]], succProb = [0.5], start = 0, end = 2\n输出:0.00000\n解释:节点 0 和 节点 2 之间不存在路径\n\n\n
\n\n
提示:
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