首先判断是不是凸多边形 然后判断圆是否在凸多边形内 不知道给出的点是顺时针还是逆时针,所以用判断是否在多边形内的模板,不用是否在凸多边形内的模板 POJ 1584 A Round Peg in a Ground Hole(判断凸多边形,点到线段距离,点在多边形内) #include <iostream> #include <cstdio> #include <cstring> #include <algorithm> #include <cmath&g…

链接: http://poj.org/problem?id=1584 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=22013#problem/D A Round Peg in a Ground Hole Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 4475   Accepted: 1374 Description The DIY Furniture com…

A Round Peg in a Ground Hole Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 4438   Accepted: 1362 Description The DIY Furniture company specializes in assemble-it-yourself furniture kits. Typically, the pieces of wood are attached to on…

A Round Peg in a Ground Hole Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 5456   Accepted: 1735 Description The DIY Furniture company specializes in assemble-it-yourself furniture kits. Typically, the pieces of wood are attached to on…

A Round Peg in a Ground Hole Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 6682   Accepted: 2141 Description The DIY Furniture company specializes in assemble-it-yourself furniture kits. Typically, the pieces of wood are attached to on…

先判断是不是N多边形,求一下凸包,如果所有点都用上了,那么就是凸多边形 判断圆是否在多边形内, 先排除圆心在多边形外的情况 剩下的情况可以利用圆心到每条边的最短距离与半径的大小来判断 #include<cstdio> #include<cstring> #include<vector> #include<cmath> #include<queue> #include<list> #include<algorithm> us…

http://poj.org/problem?id=1584 题意 按照顺时针或逆时针方向输入一个n边形的顶点坐标集,先判断这个n边形是否为凸包. 再给定一个圆形(圆心坐标和半径),判断这个圆是否完全在n边形内部. 分析 1.判断给出了多边形是不是凸多边形. 2.判断圆包含在凸多边形中:一定要保证圆心在凸多边形里面.然后判断圆心到每条线段的距离要大于等于半径.. #include <iostream> #include <stdio.h> #include <string.h…

题意: 给一个圆和一个多边形,多边形点可能按顺时针给出,也可能按逆时针给出,先判断多边形是否为凸包,再判断圆是否在凸包内. 解法: 先判是否为凸包,沿着i=0~n,先得出初始方向dir,dir=1为逆时针,dir=-1为顺时针,然后如果后面有两个相邻的边叉积后得出旋转方向为nowdir,如果dir*nowdir < 0,说明方向逆转了,即出现了凹点,说明不是凸多边形. 然后判圆是否在多边形内: 先判圆心是否在多边形内,用环顾法,然后如果在之内,则依次判断圆心与每条凸包边的距离与半径的距离,如果所…

题目传送门 题意:判断给定的多边形是否为凸的,peg(pig?)是否在多边形内,且以其为圆心的圆不超出多边形(擦着边也不行). 分析:判断凸多边形就用凸包,看看点集的个数是否为n.在多边形内用叉积方向来判断,最后再用点到直线的距离和半径比大小(不是线段) /************************************************ * Author :Running_Time * Created Time :2015/11/2 星期一 19:49:13 * File Nam…

链接: http://poj.org/problem?id=1584 http://acm.hust.edu.cn/vjudge/contest/view.action?cid=22013#problem/D A Round Peg in a Ground Hole Time Limit: 1000MS   Memory Limit: 10000K Total Submissions: 4475   Accepted: 1374 Description The DIY Furniture com…