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…

半平面的交,二分的方法: #include<cstdio> #include<algorithm> #include<cmath> #define eps 1e-6 using namespace std; int dcmp(double x) { : (x > ? : -); } struct Point { double x; double y; Point(, ):x(x), y(y) {} }; typedef Point Vector; Vector o…

题目链接:http://acm.hust.edu.cn/vjudge/problem/viewProblem.action?id=11358 [思路] 二分法+半平面交 二分与海边的的距离,由法向量可以得到平移后的各边,半平面交在特定精度判断是否有交集. [代码] #include<cmath> #include<cstdio> #include<cstring> #include<algorithm> using namespace std; ; stru…

点击打开链接 题意: 按顺序给出一小岛(多边形)的点 求岛上某点离海最远的距离 解法: 不断的收缩多边形(求半平面交) 直到无限小 二分收缩的距离即可 如图 //大白p263 #include <cmath> #include <cstdio> #include <cstring> #include <string> #include <queue> #include <functional> #include <set>…

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>…

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…

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 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…

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…