/* poj3348 Cows 凸包+多边形面积 水题 floor向下取整,返回的是double */ #include<stdio.h> #include<math.h> #include <algorithm> using namespace std; const double eps = 1e-8; struct point { double x,y; }; int n; point dian[10000+10],zhan[10000+10]; /////////…

Cows Time Limit: 2000MS   Memory Limit: 65536K Total Submissions: 7739   Accepted: 3507 Description Your friend to the south is interested in building fences and turning plowshares into swords. In order to help with his overseas adventure, they are f…

Description Your friend to the south is interested in building fences and turning plowshares into swords. In order to help with his overseas adventure, they are forced to save money on buying fence posts by using trees as fence posts wherever possibl…

题目传送门 题意:告诉若干个矩形的信息,问他们在凸多边形中所占的面积比例 分析:训练指南P272,矩形面积长*宽,只要计算出所有的点,用凸包后再求多边形面积.已知矩形的中心,向量在原点参考点再旋转,角度要转换成弧度制. /************************************************ * Author :Running_Time * Created Time :2015/11/10 星期二 10:34:43 * File Name :UVA_10652.cpp…

题目大意: 给定的n个点 能圈出的最大范围中 若每50平方米放一头牛 一共能放多少头 求凸包 答案就是 凸包的面积/50 向下取整 /// 求多边形面积// 凹多边形同样适用 因为点积求出的是有向面积 double areaPg() { ; ;i<k-;i++) // 以t[0]为划分顶点 res+=(t[i]-t[]).det(t[i+]-t[]); return res/2.0; } #include <cstdio> #include <algorithm> #incl…

LINK 题意:给出点集,求凸包的面积 思路:主要是求面积的考察,固定一个点顺序枚举两个点叉积求三角形面积和除2即可 /** @Date : 2017-07-19 16:07:11 * @FileName: POJ 3348 凸包面积 叉积.cpp * @Platform: Windows * @Author : Lweleth (SoungEarlf@gmail.com) * @Link : https://github.com/ * @Version : $Id$ */ #include <…

graham扫描法,参考yyb #include <algorithm> #include <iostream> #include <cstdio> #include <cmath> using namespace std; int n, din; const double eps=1e-7; struct Point{ double x, y; Point(double u=0.0, double v=0.0){ x = u; y = v; } doubl…

题目传送门 题意:求凸包 + (int)求面积 / 50 /************************************************ * Author :Running_Time * Created Time :2015/11/4 星期三 11:13:29 * File Name :POJ_3348.cpp ************************************************/ #include <cstdio> #include <a…

一个简单的用叉积求任意多边形面积的题,并不难,但我却错了很多次,double的数据应该是要转化为long long,我转成了int...这里为了节省内存尽量不开数组,直接计算,我MLE了一发...,最后看了下别人的才过,我的代码就不发了,免得误导,不得不说几何真是... 还有就是这个大神的代码,貌似G++,过不了,C++AC #include <iostream> #include <algorithm> #include <cstdio> #include <c…

题目链接:https://cn.vjudge.net/problem/POJ-3348 题意 啊模版题啊 求凸包的面积,除50即可 思路 求凸包的面积,除50即可 提交过程 AC 代码 #include <cmath> #include <cstdio> #include <vector> #include <algorithm> using namespace std; const double eps=1e-10; struct Point{ doubl…