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 in a graph only if there is aback edgepresent in the graph. A back edg...
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...
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...
15. Pattern: Topological Sort (Graph),拓扑排序类型 拓扑排序模式用来寻找一种线性的顺序,这些元素之间具有依懒性。比如,如果事件B依赖于事件A,那A在拓扑排序顺序中排在B的前面。 这种模式定义了一种简单方式来理解拓扑排序这种技术。 这种模式是这样奏效的: 初始化a) 借助于HashMap将图保存成邻接表形式。b) ...
1857 Largest Color Value in a Directed Graph Hard Solution 1858 Longest Word With All Prefixes Medium Solution 1859 Sorting the Sentence Easy Solution 1860 Incremental Memory Leak Medium Solution 1861 Rotating the Box Medium Solution 1862 Sum of Floored Pairs Hard Solution 1863 Sum of All Subset XO...
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...
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....
Hints: This problem is equivalent to finding if a cycle exists in a directed graph. If a cycle exists, no topological ordering exists and therefore it will be impossible to take all courses. There are several ways to represent a graph. For example, the input prerequisites is a graph ...
这一道题不能用Topological sort是因为topological sort只能在DAG(A指Acyclic)里面找出一条路径,而这里只是directed graph, 环是可能存在的 Eulerian Path This problem is to find Eulerian path. Greedy DFS, building the route backwards when retreating. ...