ZOJ 1360 Radar Installation

来源：互联网发布：mac怎么安装外来软件编辑：程序博客网时间：2024/05/18 14:14

贪心。

n年前的代码了……好无耻啊。。。。

#include <iostream>#include <stdio.h>#include <algorithm>#include <vector>#include <cmath>using namespace std;struct Node {        int x, y;        double xx;};bool cmp(Node a, Node b) {        return (a.x > b.x);}double distant(double x1, double y1, double x2, double y2) {        return sqrt((x1-x2)*(x1-x2) + (y1-y2)*(y1-y2));}int work(int n, int d) {        vector<Node> site;        Node tmp;        for (int i=0; i<n; i++) {                scanf("%d %d", &tmp.x, &tmp.y);                if (tmp.y > d)                        return -1;        tmp.xx = tmp.x + sqrt(d*d - tmp.y*tmp.y);                site.push_back(tmp);        }        sort(site.begin(), site.end(), cmp);        int count = 1;        double xx;        tmp = site.back();    site.pop_back();        xx = tmp.xx;                while (!site.empty()) {                    tmp = site.back();                    site.pop_back();                    if (distant(tmp.x, tmp.y, xx, 0) <= d)                continue;            else if (tmp.xx < xx)                xx = tmp.xx;            else {                count++;                xx = tmp.xx;            }                }        return count;}int main() {        int n, d;        int i=0;        while (scanf(" %d %d", &n, &d) == 2) {                if (n==0 && d==0)                        break;                i++;                int result = work(n, d);                printf("Case %d: %d\n", i, result);        }        return 0;}