int[][] edges = {{0, 1}, {1, 2}, {2, 0}}; boolean result = so.hasCycleDirectedGraph(3, edges); System.out.println(result); } } Detect Cycle in Undirected Graph 无向图找环 Given n nodes labeled from 0 to n - 1 and a list of undirected edges (each edge is a pair of n...
Dectect cycle in directed graph: Detect cycle in a directed graph is using aDFS. Depth First Traversal can be used to detect cycle in a Graph. DFS for a connected graph produces a tree. There is a cycle in a graph only if there is aback edgepresent in the graph. A back edge is an...
LeetCode 261. Graph Valid Tree DFS https://www.geeksforgeeks.org/check-given-graph-tree/ 判断一个Graph是否为Tree有两个条件:1) 连通图 2) 没有环 这道题是无向图,判断有没有环可以dfs来做,比有向图容易很多。 dfs判断图是否有环:Detect Cycle In Directed/Undirected Graph 判断是否是连通图很容易...
1857.Largest-Color-Value-in-a-Directed-Graph (H-) 2050.Parallel-Courses-III (M+) 2115.Find-All-Possible-Recipes-from-Given-Supplies (M) 2127.Maximum-Employees-to-Be-Invited-to-a-Meeting (H) 2192.All-Ancestors-of-a-Node-in-a-Directed-Acyclic-Graph (M) 2204.Distance-to-a-Cycle-in-...
Linked List Cycle Add all completed solutions Dec 28, 2021 List the Products Ordered in a Period 619. Biggest Single Number Apr 30, 2022 Longer Contiguous Segments of Ones than Zeros Add all completed solutions Dec 28, 2021 Longest Common Prefix Add all completed solutions Dec 28, 2021 ...
Linked List Cycle Kth Largest Element in an Array 5. 刷题建议:刷题不仅是解题,重在总结 最后给你几个刷题中的注意事项: 坚持每天刷题,保持节奏:每天刷 3-5 道题,坚持一段时间后,你会发现算法思维有显著提升。 重视题解和总结:每次遇到不会的题,不要死磕太久,可以看题解学习其他人的思路,理解每个解法...
事情是这样的. 下面这个就是我在GitHub上面自动生成的LintCode表格. 当时先做的是LintCode, 大约有150来道。 现在转手来做LeetCode,作为复习和...
1857. Largest Color Value in a Directed Graph 题意: 给一个有向图,每个vertex都被标记了一个小字母 (a-z),对于任意的path,他们都有字母和其对应的频率,我们要找出最大的频率是多少?如果这个图有环的话我们直接输出 -1 思路: 首先我们可以做一下有向图找环的算法去查一下这图有没有环,如果有环我们可...
class Solution { public: vector<int> findMinHeightTrees(int n, vector<vector<int>>& edges) { if(n==1){ return vector<int>{0}; }else if(n==2){ return edges[0]; } Graph graph(n,edges); vector<int> result; int min_dist = n; for(int i=0;i<n;i++){ int dist = graph....
Cycle - Easy #141Code - Linked List Cycle - Easy #141Explanation - Reverse Linked List - Easy #206Code - Reverse Linked List - Easy #206Explanation - Add Two Numbers - Medium #2Code - Add Two Numbers - Medium #2Explanation - Remove Nth Node From End of List - Medium #19Code - ...