Most Distant Point from the Sea Time Limit: 5000MS   Memory Limit: 65536K Total Submissions: 5153   Accepted: 2326   Special Judge Description The main land of Japan called Honshu is an island surrounded by the sea. In such an island, it is natural t…

Description The main land of Japan called Honshu is an island surrounded by the sea. In such an island, it is natural to ask a question: “Where is the most distant point from the sea?” The answer to this question for Honshu was found in 1996. The mos…

http://poj.org/problem?id=3525 给出一个凸包,要求凸包内距离所有边的长度的最小值最大的是哪个 思路:二分答案,然后把凸包上的边移动这个距离,做半平面交看是否有解. #include<cstdio> #include<iostream> #include<cmath> #include<cstring> #include<algorithm> const double finf=1e10; ; ); int n,tot…

Most Distant Point from the Sea Time Limit: 5000MS   Memory Limit: 65536K Total Submissions: 3476   Accepted: 1596   Special Judge Description The main land of Japan called Honshu is an island surrounded by the sea. In such an island, it is natural t…

Most Distant Point from the Sea [题目链接]Most Distant Point from the Sea [题目类型]半平面交 &题解: 蓝书279 二分答案,判断平移后的直线的半平面交是否为空. 模板是照着敲的,还有一些地方不是很懂, 应该还要慢慢体会吧 &代码: #include <cstdio> #include <cmath> #include <algorithm> #include <vector>…

题目链接 题意 : 给你一个多边形,问你里边能够盛的下的最大的圆的半径是多少. 思路 :先二分半径r,半平面交向内推进r.模板题 #include <stdio.h> #include <string.h> #include <iostream> #include <math.h> ; using namespace std ; struct node { double x; double y ; } p[],temp[],newp[];//p是最开始的多边…

题目就是求多变形内部一点. 使得到任意边距离中的最小值最大. 那么我们想一下,可以发现其实求是看一个圆是否能放进这个多边形中. 那么我们就二分这个半径r,然后将多边形的每条边都往内退r距离. 求半平面交看是否存在解即可 #include <iostream> #include <cstdio> #include <cstring> #include <string> #include <algorithm> #include <cstdli…

给你一个凸多边形,问在里面距离凸边形最远的点. 方法就是二分这个距离,然后将对应的半平面沿着法向平移这个距离,然后判断是否交集为空,为空说明这个距离太大了,否则太小了,二分即可. #pragma warning(disable:4996) #include <iostream> #include <cstring> #include <cstdio> #include <vector> #include <cmath> #include <…

二分+计算几何/半平面交 半平面交的学习戳这里:http://blog.csdn.net/accry/article/details/6070621 然而这题是要二分长度r……用每条直线的距离为r的平行线来截“凸包” 做平行线的方法是:对于向量(x,y),与它垂直的向量有:(y,-x)和(-y,x),然后再转化成单位向量,再乘以 r ,就得到了转移向量tmp,设直线上两点为A(x1,y1),B(x2,y2),用这个方法就找到了直线AB的平行线CD,其中C=A+tmp,D=b+tmp; 然而我傻逼…

Description The main land of Japan called Honshu is an island surrounded by the sea. In such an island, it is natural to ask a question: “Where is the most distant point from the sea?” The answer to this question for Honshu was found in 1996. The mos…