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 <…

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…

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>…

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…

题目描述: vjudge POJ 题解: 二分答案+半平面交. 半径范围在0到5000之间二分,每次取$mid$然后平移所有直线,判断半平面交面积是否为零. 我的eps值取的是$10^{-12}$,36ms,而且和样例一样. (大力推荐) 代码: #include<cmath> #include<vector> #include<cstdio> #include<cstring> #include<algorithm> using namespa…

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…

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…

Most Distant Point from the Sea Time Limit: 5000MS   Memory Limit: 65536K Total Submissions: 3955   Accepted: 1847   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…

按逆时针顺序给出n个点,求它们组成的多边形的最大内切圆半径. 二分这个半径,将所有直线向多边形中心平移r距离,如果半平面交不存在那么r大了,否则r小了. 平移直线就是对于向量ab,因为是逆时针的,向中心平移就是向向量左手边平移,求出长度为r方向指向向量左手边的向量p,a+p指向b+p就是平移后的向量. 半平面交就是对于每个半平面ax+by+c>0,将当前数组里的点(一开始是所有点)带入,如果满足条件,那么保留该点,否则,先看i-1号点是否满足条件,如果满足,那么将i-1和i点所在直线和直线ax+…

题目传送门 题意:凸多边形的小岛在海里,问岛上的点到海最远的距离. 分析:训练指南P279,二分答案,然后整个多边形往内部收缩,如果半平面交非空,那么这些点构成半平面,存在满足的点. /************************************************ * Author :Running_Time * Created Time :2015/11/10 星期二 14:16:17 * File Name :LA_3890.cpp ********************…