Every integer representedinthe 2D-array will be between1and N,whereNisthe size of the input array. 题解:我是用并查集解的。对于每一条边的两个结点,如果他们的爸爸不是同一个爸爸,那么就 unoin 这两个结点,如果他们两个的爸爸是同一个爸爸,就说明这条边多余了,直接返回这条边就行
You are given a string s, and an array of pairs of indices in the string pairs where pairs[i] = [a, b] indicates 2 indices(0-indexed) of the string. You can swap the characters at any pair of indices in the given pairs any number of times. Return the lexicographically smallest str...
publicclassUnionFind01implementsUF{//我们第一种实现,Union-Find本质就是一个数组privateint[]id;//有参构造:指定并查集中元素的个数publicUnionFind01(int size){id=newint[size];//初始化, 每一个id[i]指向自己, 没有合并的元素for(int i=0;i<id.length;i++)id[i]=i;}@OverridepublicintgetSize(...
LeetCode 547. Friend Circles Dylan_Java_NYC 2018-01-01 07:15 阅读:576 评论:0 推荐:0 LintCode Find the Weak Connected Component in the Directed Graph Dylan_Java_NYC 2017-02-04 12:06 阅读:561 评论:0 推荐:0 LeetCode 323. Number of Connected Components in an Undirected Graph Dyla...
Union Find # 灵活使用并查集的思想,熟练掌握并查集的 模板,模板中有两种并查集的实现方式,一种是路径压缩 + 秩优化的版本,另外一种是计算每个集合中元素的个数 + 最大集合元素个数的版本,这两种版本都有各自使用的地方。能使用第一类并查集模板的题目有:第 128 题
[435. 无重叠区间](https://leetcode-cn.com/problems/non-overlapping-intervals/) 一维 方法一、模拟 方法二、并查集 [1569. 将子数组重新排序得到同一个二叉查找树的方案数](https://leetcode.cn/problems/number-of-ways-to-reorder-array-to-get-same-bst/) [LCS 03. 主题空间](https://leetcode.cn...
🎭 PsuendoCode 🧩 Bit Manipulation Pattern 🧩 ⏰: O(1) 🪐: O(1) return (n & (n - 1)) == 0; ❓ FIND UNIQUE NUMBER IN ARRAY OF PAIRS 🐣 Single Number, Find the Missing Number, Find the Duplicate Number, Find the Corrupt Pair, etc. 2️⃣ Bitwise AND 🎭 Psu...
(https://leetcode.cn/problems/gcd-sort-of-an-array/) 2429 // // 数组标记/区间合并相关 // - 经典模型是一维区间覆盖染色,通过倒序+并查集解决 // - 顺带补充下二维的情况(非并查集):LC2718 https://leetcode.cn/problems/sum-of-matrix-after-queries/ // https://codeforces.com/...
// - [952. 按公因数计算最大组件大小](https://leetcode.cn/problems/largest-component-size-by-common-factor/) 2272 // 下标距离有上界 https://codeforces.com/contest/1978/problem/F // - [1998. 数组的最大公因数排序](https://leetcode.cn/problems/gcd-sort-of-an-array/) 2429 ...
leetcode 1266. Minimum Time Visiting All Points 2019-11-24 21:40 −On a plane there are n points with integer coordinates points[i] = [xi, yi]. Your task is to find the minimum time in seconds to visit a... 琴影 0 625