POJ1328Radar Installation

http://poj.org/problem?id=1328

题的大意就是说在海里有小岛，坐标位置会给出，需要岸边的雷达覆盖所有的小岛，但雷达的覆盖范围有限，所以，需要最少的雷达覆盖所有的小岛，但若是有小岛没法被雷达给覆盖到，就输出-1；

这个题的话可以转化成区间问题就是看雷达的覆盖范围作为半径，A若是小岛的位置，根据雷达的覆盖范围只要不小于这个点的Y坐标，那个覆盖范围就是这个三角形的斜边，所以只要雷达位于1,2边上就可以覆盖到这个小岛

 1 #include<cstdio>
 2 #include<cstring>
 3 #include<iostream>
 4 #include<cstdlib>
 5 #include<cmath>
 6 #include<algorithm>
 7 using namespace std ;
 8 struct node
 9 {
10     double x,y;
11 } s[10001];
12 int cmp(struct node a,struct node b)
13 {
14     if(a.y< b.y)
15         return 1;
16     else return 0 ;
17 }
18 int main()
19 {
20     int n,d ;
21     int cnt = 1;
22     while(cin>>n>>d)
23     {
24
25         int flag = 0 ;
26         if(n == 0&&d == 0) break ;
27         double a,b ;
28         for(int i = 1 ; i <= n ; i++)
29         {
30             scanf("%lf %lf",&a,&b);
31             if(fabs(b) > d)
32                 flag = 1 ;
33             s[i].x = a-sqrt(d*d-b*b);
34             s[i].y = a+sqrt(d*d-b*b);
35         }
36         cout<<"Case"<<' '<<cnt<<':'<<' ';
37         if(flag == 1)
38             cout<<"-1"<<endl ;
39         else
40         {
41             sort(s+1,s+1+n,cmp);
42             int sum = 1;
43             double zhizhen = s[1].y;
44             for(int i = 2 ; i <= n ; i++)
45             {
46                 if(s[i].x>zhizhen)
47                 {
48                     sum++;
49                     zhizhen = s[i].y;
50                 }
51             }
52
53             cout<<sum<<endl;
54         }
55         cnt++;
56     }
57     return 0;
58 }

View Code

转载于:https://www.cnblogs.com/luyingfeng/p/3239360.html

POJ1328Radar Installation相关推荐

POJ1328-Radar Installation
描述: Assume the coasting is an infinite straight line. Land is in one side of coasting, sea in the ot ...
Installation failed with message Invalid File:(Application Installatino Failed)
导入一个demo 运行发现上图问题, Application Installation Failed 最后自己清理下工程就好了参考方法: Click Build tab ---> Clean ...
Installation error: INSTALL_FAILED_INSUFFICIENT_STORAGE
今天运行ecplise的时候解决方法: Installation error: INSTALL_FAILED_INSUFFICIENT_STORAGE这个错误是表示,安卓系统存储空间不足了,无法再安 ...
SAP Netweaver 7.4 SR2 Application Java Installation
记录一下SAP Netweaver 7.4 Support Release 2 Application Server Java的安装过程. 一.下载写本文时,SAP Netweaver 7.4 SR ...
安装View Agent失败: The system must be rebooted before installation can continue
问题现象: 1.不能执行安装VMware View Agent程序 2.安装VMware View Agent失败,出现错误信息:The system must be rebooted before ...
Error in install.packages : cannot remove prior installation of package
Error in install.packages : cannot remove prior installation of package 目录 Error in install.packages ...
IBM Installation Manager 工具概述（转）
IBM Installation Manager 工具概述 IBM Installation Manager 是一款可运行在多种平台(如 IBM i. z/OS. Windows. Linux.Uni ...
计算机网络环境及应用系统的安装与调试（Computer network environment and application system installation and debugging）
计算机网络环境及应用系统的安装与调试(Computer network environment and application system installation and debugging) W ...
无线局域网安装与调试（Wireless LAN installation and commissioning）
无线局域网安装与调试(Wireless LAN installation and commissioning) 在校园内,无线局域网与现有校园网链接无线统一网络AC功能描述 Configuratio ...
Installation error: INSTALL_FAILED_VERSION_DOWNGRADE Android
我们在安装新的 APk 的时候.会出现 Installation error: INSTALL_FAILED_VERSION_DOWNGRADE 原因: 是由于 androidversionCode ...

POJ1328Radar Installation

POJ1328Radar Installation相关推荐

最新文章

热门文章