poj 1328 Radar Installation
2012-02-25 09:06
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http://poj.org/problem?id=1328
题意:在一个海岸线上按一些雷达,是雷达可以覆盖海面的小岛,问最少安装多少雷达;
思路:快拍+贪心;
代码:
View Code
题意:在一个海岸线上按一些雷达,是雷达可以覆盖海面的小岛,问最少安装多少雷达;
思路:快拍+贪心;
代码:
View Code
#include <stdio.h> #include <iostream> #include <algorithm> #include <cstring> #include <cstdlib> #include <string.h> #include <cmath> using namespace std; struct node { double l; double r; }link[1001]; int num = 0; double len = 0; int cmp(node a,node b) { return a.l <b.l; } int main() { double a = 0,b = 0; int time = 0; while(scanf("%d%lf",&num,&len),num != 0&&len != 0) { ++time; int biao = 0; double dd = 0; int nu = 1; for(int i = 0; i < num ;++i) { scanf("%lf%lf",&a,&b); if(b > len) biao = 1; link[i].l = a - sqrt(len *len - b * b); link[i].r = a + sqrt(len *len - b * b); } if(biao) { printf("Case %d: -1\n",time); continue; } sort(link,link+num,cmp); dd = link[0].r; for(int i = 1; i <num; ++i) { if(link[i].l <= dd) dd = min(link[i].r,dd); else { nu++; dd = link[i].r; } } printf("Case %d: %d\n",time,nu); } return 0; }
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