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...
这里是从上而下的更新,可以使用最常用的先序遍历,可以参见这道题Binary Tree Preorder Traversal,这样更新下来,所有的 res[i] 就都是题目中要求的值了,参见代码如下: classSolution{public:vector<int>sumOfDistancesInTree(intN, vector<vector<int>>& edges){vector<int>res(N),count(N); vector<vector<in...
树中距离之和 Sum of Distances in Tree 132 -- 10:09 App LeetCode力扣 493. 翻转对 Reverse Pairs 136 -- 7:44 App LeetCode力扣 56. 合并区间 Merge Intervals 389 -- 11:26 App Python每日一练-字典数组练习-歌唱比赛名次 156 -- 7:23 App LeetCode力扣 118. 杨辉三角 Pascal's Triangle...
2972. 统计移除递增子数组的数目 II Count the Number of Incremovable Subarrays 力扣 LeetCode 题解 12:00 2970. 统计移除递增子数组的数目 I Count the Number of Incremovable Subarrays I 力扣 LeetCode 题解 05:41 3102. 最小化曼哈顿距离 Minimize Manhattan Distances 力扣 LeetCode 题解 17:31 ...
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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....
【leetcode】834. Sum of Distances in Tree(图算法) There is an undirected connected tree with n nodes labeled from 0 to n - 1 and n - 1 edges. 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 ...
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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All elements of each string will have an ASCII value in[97, 122]. 解题思路: 这道题可以用动态规划来解,可以参考edited distances dp[i][j]: 将s1的前i个字符构成的子串转换成s2前j个字符串构成的子串删掉的最小的ascii码 初始化: n = s2.size(), m = s1.size(); ...