然后根据最小高度树(MHT)的定义,过滤掉所有树中高度最小的根。 上面描述第一步,其实就是N-ary Tree的Maximum Depth问题,就是求根节点到叶子节点的最大距离。我们可以应用 DFS 或 BFS 算法。 然而,这种解法效率不高,其时间复杂度为O(N^2) 其中 N 是树的节点数。会导致TLE。 本文将介绍一种时间复杂度为O...
LeetCode-Minimum Height Trees For a undirected graph with tree characteristics, we can choose any node as the root. The result graph is then a rooted tree. Among all possible rooted trees, those with minimum height are called minimum height trees (MHTs). Given such a graph, write a functi...
According to thedefinition of tree on Wikipedia: “a tree is an undirected graph in which any two vertices are connected byexactlyone path. In other words, any connected graph without simple cycles is a tree.” The height of a rooted tree is the number of edges on the longest downward pa...
According to the definition of tree on Wikipedia: “a tree is an undirected graph in which any twoverticesare connected by exactly one path. In other words, any connected graph without simple cycles is a tree.” The height of a rooted tree is the number of edges on the longest downward ...
https://leetcode.com/problems/minimum-height-trees/ 有trick 对graph不熟悉。再看几遍。 参考http://bookshadow.com/weblog/2015/11/26/leetcode-minimum-height-trees/ 基本思路是“逐层删去叶子节点,直到剩下根节点为止” 有点类似于拓扑排序
Leetcode 310. Minimum Height Trees 题目: For a undirected graph with tree characteristics, we can choose any node as the root. The result graph is then a rooted tree. Among all possible rooted trees, those with minimum height are called minimum height trees (MHTs). Given such a graph, ...
The result graph is then a rooted tree. Among all possible rooted trees, those with minimum height are called min...LeetCode 310. Minimum Height Trees 解法 LeetCode 310. Minimum Height Trees 解法 最简单的解法就是DFS遍历,即从每个节点出发,计算到达末端节点的最大路径长度,那么此路径长度最小的...
【Leetcode】Minimum Height Trees 题目链接:https://leetcode.com/problems/minimum-height-trees/ 题目: For a undirected graph with tree characteristics, we can choose any node as the root. The result graph is then a rooted tree. Among all possible rooted trees, those with minimum height are ...
Can you solve this real interview question? Minimum Depth of Binary Tree - Given a binary tree, find its minimum depth. The minimum depth is the number of nodes along the shortest path from the root node down to the nearest leaf node. Note: A leaf is a
Can you solve this real interview question? Minimum Time to Collect All Apples in a Tree - Given an undirected tree consisting of n vertices numbered from 0 to n-1, which has some apples in their vertices. You spend 1 second to walk over one edge of the