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(N) 的
来自专栏 · LeetCode Description For an 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 ...
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...
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...
Can you solve this real interview question? Minimum Height Trees - A tree is an undirected graph in which any two vertices are connected by exactly one path. In other words, any connected graph without simple cycles is a tree. Given a tree of n nodes la
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】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 ...
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 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, ...
Minimum Height Trees (DFS)的DFS遍历过程是怎样的? 题目 给你一个无向无环图,这个图的任何一个节点都可以当成一个树的根节点。让你找到形成的树的高度最小的那几个根节点。 首先,这个根节点要么只有1个,要么只有2个。 而且就在图中最长的一条路径上,如果这个路径上的节点数为偶数,那就是2个,否则就是1...