Beauty Contest Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 33115   Accepted: 10278 Description Bessie, Farmer John's prize cow, has just won first place in a bovine beauty contest, earning the title 'Miss Cow World'. As a result, Bes…

给定点集的最远两点的距离. 先用graham求凸包.旋(xuán)转(zhuàn)卡(qiǎ)壳(ké)求凸包直径. ps:旋转卡壳算法的典型运用 http://blog.csdn.net/hanchengxi/article/details/8639476. #include <cstdio> #include <cmath> #include <algorithm> #define sqr(x) (x)*(x) #define N 50001 using names…

题目链接 嗯,毒瘤题. 首先有一个结论,就是最小矩形一定有条边和凸包重合.脑补一下就好了. 然后枚举凸包的边,用旋转卡壳维护上顶点.左端点.右端点就好了. 上顶点用叉积,叉积越大三角形面积越大,对应的高也就越大.两边的点用点积,点积越大投影越大. 然后就是精度问题.这种实数计算最好不要直接用比较运算符,要用差和\(eps\)的关系来比较,我就是一直卡在这里.还好有爆炸\(OJ\)离线题库提供的数据... #include <cstdio> #include <cmath> #inc…

[HNOI2007]最小矩形覆盖 Time Limit: 10 Sec  Memory Limit: 162 MBSec  Special JudgeSubmit: 2081  Solved: 920[Submit][Status][Discuss] Description 给定一些点的坐标,要求求能够覆盖所有点的最小面积的矩形, 输出所求矩形的面积和四个顶点坐标   Input 第一行为一个整数n(3<=n<=50000) 从第2至第n+1行每行有两个浮点数,表示一个顶点的x和y坐标,不用科…

旋转卡壳求最小矩形覆盖的模板题. 因为最小矩形必定与凸包的一条边平行,则枚举凸包的边,通过旋转卡壳的思想去找到其他3个点,构成矩形,求出最小面积即可. #include<cstdio> #include<iostream> #include<cstring> #include<algorithm> #include<queue> #include<set> #include<map> #include<stack&g…

给你一些点,让你用最小的矩形覆盖这些点 首先有一个结论,矩形的一条边一定在凸包上!!! 枚举凸包上的边 用旋转卡壳在凸包上找矩形另外三点... 注意精度问题 #include<cstdio> #include<cmath> #include<ctime> #include<cstring> #include<iostream> #include<algorithm> #include<queue> #include<…

Squares The famous Korean IT company  plans to make a digital map of the Earth with help of wireless sensors which spread out in rough terrains. Each sensor sends a geographical data to . But, due to the inaccuracy of the sensing devices equipped in…

链接: http://poj.org/problem?id=2187 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=22013#problem/E Beauty Contest Time Limit: 3000MS   Memory Limit: 65536K Total Submissions: 24254   Accepted: 7403 Description Bessie, Farmer John's prize cow, h…

题目链接:http://poj.org/problem?id=2187 Time Limit: 3000MS Memory Limit: 65536K Description Bessie, Farmer John's prize cow, has just won first place in a bovine beauty contest, earning the title 'Miss Cow World'. As a result, Bessie will make a tour of…

旋转卡壳求凸包的直径的平方 板子题 #include<cstdio> #include<vector> #include<cmath> #include<algorithm> using namespace std; struct Point { int x, y; Point(int x=0, int y=0):x(x),y(y) { } }; typedef Point Vector; Vector operator - (const Point&…