You have a graph ofnnodes. You are given an integernand an arrayedgeswhereedges[i] = [ai, bi]indicates that there is an edge betweenaiandbiin the graph. Returnthe number of connected components in the graph. Example 1: Input: n = 5, edges = [[0,1],[1,2],[3,4]] Output: 2...
这道题和305. numbers of islands II是一个思路,一个count初始化为n,union find每次有新的edge就union两个节点,如果两个节点(u, v)原来不在一个连通图里面就减少count并且连起来,如果原来就在一个图里面就不管。用一个索引array来做,union find优化就是加权了,每次把大的树的root当做parent,小的树的root作为...
https://leetcode.com/problems/number-of-connected-components-in-an-undirected-graph/ 题目: Givennnodes labeled from0ton - 1and a list of undirected edges (each edge is a pair of nodes), write a function to find the number of connected components in an undirected graph. Example 1: 0 3 ...
Use Union Find to figure out the number of connected components 1publicclassSolution {2publicintcountComponents(intn,int[][] edges) {3unionFind uf =newunionFind(n);4for(int[] edge : edges) {5if(!uf.isConnected(edge[0], edge[1])) {6uf.union(edge[0], edge[1]);7}8}9returnuf....
323 Number of Connected Components in an Undirected Graph // #323 无向图连通分量个数 描述:如题。 //#323Description: Number of Connected Components in an Undirected Graph | LeetCode OJ 解法1:并查集。 // Solution 1: Union-find set.
祖传的手艺不想丢了,所以按顺序写一个leetcode的题解。计划每日两题,争取不卡题吧 常规题号的题目已经写到头了,开始从头补vip题的题解 323.无向图中连通分量的数目 力扣leetcode.cn/problems/number-of-connected-components-in-an-undirected-graph/ 非常标准的利用并查集维护连通性的问题。 一开始图中n个...
Number of Connected Components in an Undirected Graph (Done) 没想出来,以为还是用入度解 public class Solution { Map<Integer, Set<Integer>> map = new HashMap<Integer, Set<Integer>>(); int V; public int countComponents(int n, int[][] edges) { ...
LeetCode 上的题目是:200:岛屿数量https://leetcode-cn.com/problems/number-of-islands/,具体描述如下,这道题跟我们今天所讲的图像连通域有非常相似之处,个人猜想,上面两种库的实现应该与下面的实现思路是类似的。 代码语言:javascript 复制 给你一个由'1'(陆地)和'0'(水)组成的的二维网格,请你计算网格中岛...
Number of Provinces:https://leetcode.com/problems/number-of-provinces/ Number of Connected Components in an Undirected Graph:https://leetcode.com/problems/number-of-connected-components-in-an-undirected-graph/ Number of Operations to Make Network Connected:https://leetcode.com/problems/number-of-...
321 Create Maximum Number 19.10% Hard 322 Coin Change 24.90% Medium 323 Number of Connected Components in an Undirected Graph $ 43.30% Medium 324 Wiggle Sort II 20.10% Medium 325 Maximum Size Subarray Sum Equals k $ 39.60% Easy 326 Power of Three 35.30% Easy 327 Count of Range Sum 24.30...