题目大意:有$n$个人,$m$个政党,每个人都想投一个政党,但可以用一定的钱让他选你想让他选的政党. 现在要$1$号政党获胜,获胜的条件是:票数严格大于其他所有政党.求最小代价 题解:暴力枚举其他政党的最多得票,然后把超过的贪心收买,若$1$号政党得票不够,就继续贪心收买,更新答案,复杂度$O(n^2 \log_2 n)$($n=3000,time\;limit=2s$卡过) 卡点:1.用$pb\_ds$的$priority\_queueTIL$,换成$std:priority\_queueAC…

                                                A. Bear and Elections                                                                                                                                                                            time limi…

C. Valera and Elections   The city Valera lives in is going to hold elections to the city Parliament. The city has n districts and n - 1 bidirectional roads. We know that from any district there is a path along the roads to any other district. Let's…

[CF850E]Random Elections(FWT) 题面 洛谷 CF 题解 看懂题就是一眼题了... 显然三个人是等价的,所以只需要考虑一个人赢了另外两个人就好了. 那么在赢另外两个人的过程中,一定是两个长度为\(2^n\)的二进制串的对应值都是\(1\). 考虑每个人投票的贡献,如果是\(00\)或者\(11\)那么有两种排列,如果是\(01\)或者\(10\)就只有一种合法排列. 那么对于长度为\(2^n\)的数组自己对自己做一次异或卷积,每个数的贡献就是\(2\)的\(0\)的个数…

458C - Elections 思路: 三分凹形函数极小值域 代码: #include<bits/stdc++.h> using namespace std; #define ll long long #define pb push_back #define mem(a,b) memset(a,b,sizeof(a)) ; const int INF=0x7f7f7f7f; vector<int>g[N],vc; int n; int cost(int x){ ].size(),…

[CF850E]Random Elections 题意:有n位选民和3位预选者A,B,C,每个选民的投票方案可能是ABC,ACB,BAC...,即一个A,B,C的排列.现在进行三次比较,A-B,B-C,C-A.每次比较的结果由一个给定的函数决定$f(x):{0,1}^n\rightarrow {0,1}$,即读入一个长度为n的bool数组,返回一个bool变量.假如是A和B比较,则读入数组的第i个bool是 第i个人的排列中,A是否在B的前面:返回的bool是 A获胜还是B获胜.现在给你函数f(…

369C - Valera and Elections 思路:dfs,对于搜索到的每个节点,看他后面有没有需要修的路,如果没有,那么这个节点就是答案. 代码: #include<bits/stdc++.h> using namespace std; #define ll long long #define pb push_back ; vector<int>g[N]; vector<int>edge[N]; vector<int>ans; int dfs(i…

You are running for a governor in a small city in Russia. You ran some polls and did some research, and for every person in the city you know whom he will vote for, and how much it will cost to bribe that person to vote for you instead of whomever he…

题目链接: http://codeforces.com/problemset/problem/258/B B. Little Elephant and Elections time limit per test2 secondsmemory limit per test256 megabytes 问题描述 There have recently been elections in the zoo. Overall there were 7 main political parties: one…

A. Bear and Elections time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Limak is a grizzly bear who desires power and adoration. He wants to win in upcoming elections and rule over the Bearla…