[arc076e]connected?

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题意: 给出一个$R\times C$的棋盘,其中$1$到$N$之间的每个正整数都会在棋盘上出现两次,第$i$个数出现的位置是$(X_{i,1},Y_{i,1})$和$(X_{i,2},Y_{i,2})$,现在目的是把每一对相同的数用线(粗细忽略不计)连起来,且线不能相交也不能越过棋盘边界,求是否能完成. $1\leq R,C\leq 10^8$ $1\leq N\leq 10^5$ 题解: 看上去是神仙题,实际上很假... 大家有没有玩过麻将连连看那种小游戏?题意中的连线意义就差不多.首先如果…

NOIp2018模拟赛四十四

加量不加价?! 昨晚看时间变成了3.5h以为终于变成了正常难度,结果还是国家集训队作业... A题看起来很神仙,B题看上去很神仙,C题一看就知道很神仙: 结果发现B是假题,放榜后发现A也是假题,C是YNOI2016的真·神仙题(dllxl) 成绩:0+100+0=100 A:[agc004c]and grid B:[arc076e]connected? C:[BZOJ4940][YNOI2016]这是我自己的发明…

【arc076E】Connected?

Portal -->arc076E Description 给你一个$R*C$的矩形,矩形中某些格子的端点上填了$1\sim n$这$n$个数字,每个数字出现了恰好两遍,现在要将每一对数字用曲线连起来,线不允许出矩形,问是否存在一种连线方案使得任意两条线不相交数据范围:$1<=R,C<=10^8,1<=n<=10^5$ Solution 结论题什么的..== 实际上我们可以将..这个连线看成一个..类似切割的操作,不停地切这个平面,然后如果说两个部分不相连了…

[LeetCode] Number of Connected Components in an Undirected Graph 无向图中的连通区域的个数

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…

PTA Strongly Connected Components

Write a program to find the strongly connected components in a digraph. Format of functions: void StronglyConnectedComponents( Graph G, void (*visit)(Vertex V) ); where Graph is defined as the following: typedef struct VNode *PtrToVNode; struct VNode…

poj 1737 Connected Graph

// poj 1737 Connected Graph // // 题目大意: // // 带标号的连通分量计数 // // 解题思路: // // 设f(n)为连通图的数量,g(n)为非连通图的数量,h(n)为所有的 // 图的数量,h(n) = 2 ^(n * (n - 1) / 2); // f(n) + g[n] = h(n). // // 考虑标号为1在哪个连通分量内,设连通分量内有k个点,则问题为 // 在n-1个点中选择k-1个点的方法数 C(n-1,k-1),此时1所在的连通图数…

LeetCode Number of Connected Components in an Undirected Graph

原题链接在这里:https://leetcode.com/problems/number-of-connected-components-in-an-undirected-graph/ 题目: 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 com…