管道
题目链接:LOJ 2788
题目大意
给你一个 n 个点 m 条边的无向图不一定连通,把每个连通块看做子图,求每一个子图的桥。 n 1e5 m 6e6 空间 16 MB
思路
发现存不下所有的边,但是能存点。 那考虑能不能在一棵生成树上面搞。
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Description 小 C 最近学了很多最小生成树的算法,Prim 算法、Kurskal 算法、消圈算法等等。 正当小 C 洋洋得意之时,小 P 又来泼小 C 冷水了。小 P 说,让小 C 求出一个无向图的次小生成树,而且这个次小生成树还得是严格次小的&…
Problem Description?? has got a treasure map,the treasure map consists of N nodes,there are N-1 bidirectional roads, Each of them connects a pair of nodes,the N nodes are all connected by the N-1 bidirectional roads.?? can travel through the roads.Ther…
E. A and B and Lecture Rooms
Portal.
显然可以想到,对于两点间的最短路径 l l l,到两点距离相等的点一定为 l l l 的中点。如果 l l l 为偶数,则不存在这样的点。
有上面的思路之后,可以得到其他到两点距离相等的点经过 …
文章目录 题目描述:输出格式:输入数据:输出数据:解析题目描述: There are n houses in the village and some bidirectional roads connecting them. Every day peole always like to ask like this “How far is it if I want to go from house A to house B”? Usually…
题目 Given a binary search tree (BST), find the lowest common ancestor (LCA) of two given nodes in the BST.
According to the definition of LCA on Wikipedia: “The lowest common ancestor is defined between two nodes v and w as the lowest node in T that ha…
Problem DescriptionGive an connected undirected graph with nnodes and medges, (n,m≤105) which has no selfloops or multiple edges initially. Now we have qoperations (q≤105): ⋅1 u v: add an undirected edge from uto v; (u≠v&&1≤u,v≤n)⋅2 u v: cou…
LCA(lowest common ancestor)问题 力扣,【二叉搜索树】https://leetcode.cn/problems/er-cha-sou-suo-shu-de-zui-jin-gong-gong-zu-xian-lcof/description/ 【普通二叉树】https://leetcode.cn/problems/er-cha-shu-de-zui-jin-gong-gong-zu…
一、问题简介
最近公共祖先简称 LCA(Lowest Common Ancestor)。两个节点的最近公共祖先,就是这两个点的公共祖先里面,离根最远的那个。为了方便,我们记某点集 S { v 1 , v 2 , … , v n } S\{v_1,v_2,\ldots,v_n\} S…
A - The order of a Tree
根据二叉搜索树的性质,我们知道key[Lchild[r]]≤key[r]≤key[Rchild[r]],所以LDR遍历插入一定是同结构的最小字典序二叉搜索树 指针版:
#include <iostream>
#include <cstdlib>
using namespace s…