Summary: 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
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...
你这个学期必须选修numCourses门课程,记为0到numCourses - 1。 在选修某些课程之前需要一些先修课程。 先修课程按数组prerequisites给出,其中prerequisites[i] = [ai, bi],表示如果要学习课程ai则必须先学习课程bi。 例如,先修课程对[0, 1]表示:想要学习课程0,你需要先完成课程1。
vector<int>()); //入度个数 vector<int> in(numCourses); //初始化为有向邻接表 for (auto a : prerequisites) { graph[a[1]].push_back(a[0]); ++in[a[0]]; } //directed a
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....
思路:本题作为Leetcode 684(无向图)的进阶版,需要在一个有向图中,输出一条可以删除的路径,这条多余的路径是一个有向子图。 如果该有向图不是cycle graph,删除之后剩下的图构成一个有向树,对于有向树来说,根节点的入度(即指向该节点的边的个数)为0,其余节点为1,对于多余的节点,它的入度一定为2,即指向...
all-ancestors-of-a-node-in-a-directed-acyclic-graph all-elements-in-two-binary-search-trees all-oone-data-structure all-paths-from-source-to-target all-possible-full-binary-trees allocate-mailboxes allow-one-function-call ambiguous-coordinates angle-between-hands-of-a-clock animal-...
1857 Largest Color Value in a Directed Graph Hard Go 1863 Sum of All Subset XOR Totals Easy Python 1870 Minimum Speed to Arrive on Time Medium Python 1877 Minimize Maximum Pair Sum in Array Medium Python 1887 Reduction Operations to Make the Array Elements Equal Medium Python 1897 Redistribute ...
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...
A. cAPS lOCK (1000) B. Opposites Attract (1200) C. The World is a Theatre (1400) D. Subway (1600) (Graph Cycle) E. Yet Another Task with Queens (1700) (2D Matrix Sort) F. Present to Mom(2000) (2D Matrix + prefix + Siding window) Beta Round #98 (Div. 2)...