D. Harmonious Graph 好后悔在写这个题之前浪费了几分钟时间,不然我就写出来了.... 因为他就是连通块之间的合并问题,所以就用并查集就好了 复杂度好像也只是线性的吧... 然后就A了 代码: // Created by CAD on 2019/12/4. #include <bits/stdc++.h> using namespace std; const int maxn=2e5+5; int f[maxn]; int find(int x) { return x==f[x…

#include<iostream> using namespace std ; ; int p[N]; int cnt; int find(int x) { if(p[x]!=x) p[x]=find(p[x]); return p[x]; } int main() { int n,m; cin>>n>>m; ; i<=n; i++) p[i]=i; ; i<=m; i++) { int a,b; cin>>a>>b; int A=…

题意:对于一张图,如果$a$与$b$连通,则对于任意的$c(a<c<b)$都有$a$与$c$连通,则称该图为和谐图,现在给你一张图,问你最少添加多少条边使图变为和谐图. 思路:将一个连通块内最大的点做为根,用并查集维护,遍历一遍,对于某个点$i$及该点连通块内的根$fx$,$i$到$fx$内的每一个点,当与$i$不属于一个集合时,进行合并,答案加一,同时更新该连通块的根. #include <iostream> #include <algorithm> #include…

题目大意: n个点,m条边,两个数l和r,如果l和r相连接,那么对于l和r之间值任意一个数都要和l相连.问达到这一目的需要添加的边的最小数量. 题解: 我们首先要找到当前连通块中最大的那个点,也就是说所有小于当前点的点都要和这个点相连,如果不相连的话,加一条边,所以用我们可以用一个mark数组来标记当前当前点是否在当前联通块中,如不在的话,并且当前点的大小小于联通块的最大点的大小,我们就要加一条边.可以用dfs来遍历联通块 #include<bits/stdc++.h> using names…

传送门 A. Single Push 直接乱搞即可. Code /* * Author: heyuhhh * Created Time: 2019/11/16 22:36:20 */ #include <bits/stdc++.h> #define MP make_pair #define fi first #define se second #define sz(x) (int)(x).size() #define all(x) (x).begin(), (x).end() #define…

CF Round #600 (Div 2) 解题报告(A~E) A:Single Push 采用差分的思想,让\(b-a=c\),然后观察\(c\)序列是不是一个满足要求的序列 #include<bits/stdc++.h> using namespace std; const int maxn = 1e5 + 10; int T, n; int a[maxn], b[maxn]; int c[maxn]; int main() { cin >> T; while(T--) { s…

TimeWall is a graph databases github It be used to apply mathematic model and social network with graph algorithms and so on... Features: 1. C/S structure 2. compute in memory 3. dynamic add and remove nodes on the graph db 4. with lots of algorithms…

Source: Connected Brain Figure above: Bullmore E, Sporns O. Complex brain networks: graph theoretical analysis of structural and functional systems.[J]. Nature Reviews Neuroscience, 2009, 10(3):186-198. Graph measures A graph G consisting of a set of…

Destroying The Graph Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 8198   Accepted: 2635   Special Judge Description Alice and Bob play the following game. First, Alice draws some directed graph with N vertices and M arcs. After that B…

Given n nodes labeled from 0 to n - 1 and 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 |          | 1 --- 2    4 Given n = 5 and…