A question of details in the solution at the end of this post of the question is asked by me at MSE. Nowadays, I learnt from Liu Ben a question asked in the interview of ENS. Assume $m,n$ are two coprime odd numbers, consider the interval $[0,mn]$. W…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2426 For any school, it is hard to find a feasible accommodation plan with every student assigned to a suitable apartment while keeping everyone happy, let alone an optimal one. Recently the president of…

<题目链接> 题目大意: 学校里有n个学生和m个公寓房间,每个学生对一些房间有一些打分,如果分数为正,说明学生喜欢这个房间,若为0,对这个房间保持中立,若为负,则不喜欢这个房间.学生不会住进不喜欢的房间和没有打分的房间.问安排这n个学生来求最大的分数,如果不能够使这些学生全部入住房间,就输出-1,每个房间最多只能住一个学生. 解题分析: 因为需要求带权二分图,所以用KM算法,需要注意的是,边权为负的两点不能进行匹配,并且,最后需要判断是否符合题意,即是否所有学生都有房间. #include &…

http://acm.hdu.edu.cn/showproblem.php?pid=2426 题意:每n个学生和m个房间,现在要为每个学生安排一个房间居住,每个学生对于一些房间有一些满意度,如果满意度为负就说明该学生不喜欢住在这房间.现在问如何安排可以使所有学生的满意度总和最大.(不能将学生安排到他不喜欢的房间或者他没有评价的房间) 思路: 二分图的最佳匹配,注意题目的要求即可. #include<iostream> #include<cstdio> #include<cst…

#include <iostream> #include <queue> #include <stdio.h> #include <string.h> #include <algorithm> #define inf 1000001 using namespace std; struct node { int x,y,c,w; int next; } eg[]; ],dis[],pre[],v[]; void init() { memset(he…

原题: Description Mike wants to prepare for IMO but he doesn't know geometry, so his teacher gave him an interesting geometry problem. Let's define f([l, r]) = r - l + 1 to be the number of integer points in the segment [l, r] with l ≤ r (say that ). Y…

Mike and Geometry Problem 题目链接: http://acm.hust.edu.cn/vjudge/contest/121333#problem/I Description Mike wants to prepare for IMO but he doesn't know geometry, so his teacher gave him an interesting geometry problem. Let's define f([l, r]) = r - l + 1…

E. Mike and Geometry Problem 题目连接: http://www.codeforces.com/contest/689/problem/E Description Mike wants to prepare for IMO but he doesn't know geometry, so his teacher gave him an interesting geometry problem. Let's define f([l, r]) = r - l + 1 to…

E. Mike and Geometry Problem time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Mike wants to prepare for IMO but he doesn't know geometry, so his teacher gave him an interesting geometry pro…

任意门:http://codeforces.com/contest/689/problem/E E. Mike and Geometry Problem time limit per test 3 seconds memory limit per test 256 megabytes input standard input output standard output Mike wants to prepare for IMO but he doesn't know geometry, so…