传送门[洛谷] 自闭QAQ 什么玩意QAQ 不是很理解到底在干啥 问了巨佬以后大概是这个样子的 可以看出是最小割模型 对于每一个人 反悔的话就是代价+1 那么连接(s,i) (i,t)分别表示他最后选择赞同还是反对 根据初始状态来填代价 然后针对基友关系 他们之间连 代价为1的无向边 为什么是无向边呢 是因为 他们无论双方在哪个方向反对 只要不属于同一边的话就是有代价的 Edelweiss的PDF里还有这样的一个小补充 对于求一个函数 的最小值(其中) 对于(二者取其一)(不同有代价)这样的模型…

s向所有信仰1的人连(s,i,1),所有信仰0的人连(i,t,1),对于朋友关系,连接双向边,流量为1.跑最大流的结果即为答案. 考虑这样做的意义.最小割就是把总点集分割为两个点集S,T,使得所有\(u\in S,v\in T,val(u,v) \)的值最小.也就是说,在这道题中的意义就是使最少的边两端相异(s代表选1,t代表选0,所以违背自己就是割掉与s或者t的边). #include<iostream> #include<cstdio> #include<cstring&…

题目链接 http://acm.hdu.edu.cn/showproblem.php?pid=5925 Problem Description TanBig, a friend of Mr. Frog, likes eating very much, so he always has dreams about eating. One day, TanBig dreams of a field of coconuts, and the field looks like a large chessb…

Coconuts Time Limit: 9000/4500 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others) Problem Description TanBig, a friend of Mr. Frog, likes eating very much, so he always has dreams about eating. One day, TanBig dreams of a field of coconuts…

Coconuts Time Limit: 9000/4500 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 524    Accepted Submission(s): 151 Problem Description TanBig, a friend of Mr. Frog, likes eating very much, so he always has dreams abou…

A group of n castle guards are voting to determine whether African swallows can carry coconuts. While each guard has his own personal opinion on the matter, a guard will often vote contrary to his beliefs in order to avoid disagreeing with the votes…

题目链接: D - Coconuts  HDU - 5925 题目大意:首先是T组测试样例,然后给你n*m的矩阵,原先矩阵里面都是白色的点,然后再输入k个黑色的点.这k个黑色的点可能会使得原先白色的点分成多个联通块,然后问你白色联通块的个数和每一个连通块里面白色的点的个数. 具体思路:输入的点坐标比较大,但是个数比较小,所以离散化坐标就可以了.标记每一个整块里面的白色的点的个数就可以了. AC代码: #include<bits/stdc++.h> using namespace std; #…

Description The short story titled Coconuts, by Ben Ames Williams, appeared in the Saturday Evening Post on October 9, 1926. The story tells about five men and a monkey who were shipwrecked on an island. They spent the first night gathering coconuts.…

题目链接: http://acm.hdu.edu.cn/showproblem.php?pid=5925 Coconuts Time Limit: 9000/4500 MS (Java/Others)Memory Limit: 65536/65536 K (Java/Others) 问题描述 TanBig, a friend of Mr. Frog, likes eating very much, so he always has dreams about eating. One day, Ta…

TanBig, a friend of Mr. Frog, likes eating very much, so he always has dreams about eating. One day, TanBig dreams of a field of coconuts, and the field looks like a large chessboard which has R rows and C columns. In every cell of the field, there i…