题目链接:https://leetcode.com/problems/sum-of-distances-in-tree/ 题意:给出一棵树,对于每个节点,求出其他所有节点与该节点的距离之和。节点数不超过10000。 思路:如图所示,暴力复杂度太高,考虑进行优化,如图所示,考虑一对父子节点u与v,son[u]表示以u为根节点的子树的节点个数。若已知父节点u到其他所有...
classSolution{public:vector<int>sumOfDistancesInTree(intN, vector<vector<int>>& edges){vector<int>res(N),count(N); vector<vector<int>>tree(N);for(auto&edge : edges) { tree[edge[0]].push_back(edge[1]); tree[edge[1]].push_back(edge[0]); }helper(tree,0,-1, count, res);hel...
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834. Sum of Distances in Tree [Hard] https://leetcode.com/problems/sum-of-distances-in-tree/ An undirected, connected tree withNnodes labelled0...N-1andN-1edgesare given. Theith edge connects nodesedges[i][0]andedges[i][1]together....
You are given the integer n and the array edges where edges[i] = [ai, bi] indicates that there is an edge between nodes ai and bi in the tree. Return an array answer of length n where answer[i] is the sum of the distances between the ith node in the tree and all other nodes....
LeetCode刷题记录 传送门 Description An undirected, connected treewith N nodes labelled 0...N-1 and N-1 edges are given. The ith edge connects nodes edges[i][0] and edges[i][1] together. Return a list ans, where ans[i] is the sum of the distances between node i and all other ...
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