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...
Sum of Distances in Tree 833. Find And Replace in String 832. Flipping an Image 831. Masking Personal Information 830. Positions of Large Groups 829. Consecutive Numbers Sum 828. Unique Letter String 827. Making A Large Island 826. Most Profit Assigning Work 825. Friends Of Appropriate Ages ...
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. Return a listans, whereans[i]is the sum of the distances between nodeiand all other no...
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 ...
classSolution {public: vector<int> sumOfDistancesInTree(intn, vector<vector<int>>&edges) {//好久没做和图论相关的题目了 图论的题目 dfs bfs?//链接图链表vector<int>res(n),count(n); vector<vector<int>>tree(n);for(auto &edge:edges) ...
An undirected, connected tree withNnodes labelled0...N-1andN-1edgesare given. Theith edge connects nodesedges[i][0]andedges[i][1]together. Return a listans, whereans[i]is the sum of the distances between nodeiand all other nodes. ...