Detect cycle in undirected graph: method 1: Union FindThe time complexity of the union-find algorithm is O(ELogV).
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...
2. Also, you could not based on it to detect a cycle. The above method only worksforDirected Graph. Analysis: ActuallyforUndireted Grpah, we have a classic algorithm to testifthere is a circle in the graph. And how many independent sets are there in a graph. The classic method is c...
Provide all my solutions and explanations in Chinese for all the Leetcode coding problems. Same as this: LeetCode All in One 题目讲解汇总(持续更新中...) Click below image to watch YouTube Video Note: All explanations are written in Github Issues, please do not create any new issue or ...
For this problem, a height-balanced binary tree is defined as a binary tree in which the depth of the two subtrees ofeverynode never differ by more than 1. 【解答】checkBalanced方法用来递归检查是否平衡的,返回树高度,偷了个巧,如果发现不平衡抛出TreeUnbalancedException异常: ...
2192.All-Ancestors-of-a-Node-in-a-Directed-Acyclic-Graph (M) 2204.Distance-to-a-Cycle-in-Undirected-Graph (M) 2392.Build-a-Matrix-With-Conditions (M+) 2440.Create-Components-With-Same-Value (H-) 2603.Collect-Coins-in-a-Tree (H-) Dijkstra (BFS+PQ) 743.Network-Delay-Time (H-) 40...
for i in nums: last, now = now, max(last + i, now) return now*** ### 310. 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 heigh...
LeetCode 刷题随手记 - 第一部分 前 256 题(非会员),仅算法题,的吐槽 https://leetcode.com/problemset/algorithms/...
if (hasCycle(-1, 0, visited, adjList)) // has cycle? return false; if (visited.size() != n) // is all connected? return false; return true; } private boolean hasCycle(Integer pred, Integer vertex, HashSet<Integer> visited, List<List<Integer>> adjList) { ...
2357. Make Array Zero by Subtracting Equal Amounts 2358. Maximum Number of Groups Entering a Competition 2359. Find Closest Node to Given Two Nodes 2360. Longest Cycle in a GraphWeekly Contest 3032351. First Letter to Appear Twice 2352. Equal Row and Column Pairs 2353. Design a Food ...