HDU 5120 A Curious Matt(2014北京赛区现场赛A题 简单模拟）

题目链接：http://acm.hdu.edu.cn/showproblem.php?pid=5112

解题报告：扫一遍

 1 #include<cstdio>
 2 #include<cstring>
 3 #include<iostream>
 4 #include<algorithm>
 5 #include<cmath>
 6 using namespace std;
 7 const int maxn = 1e6+5;
 8
 9 struct node
10 {
11     double t,x;
12 }rec[maxn];
13 double Max(double a,double b)
14 {
15     return a > b? a : b;
16 }
17 bool cmp(node a,node b)
18 {
19     return a.t < b.t;
20 }
21 double Fabs(double d)
22 {
23     return d > 0? d:-1.0*d;
24 }
25 int main()
26 {
27     int T,n,kase = 1;
28     scanf("%d",&T);
29     while(T--)
30     {
31         scanf("%d",&n);
32         for(int i = 0;i < n;++i)
33         scanf("%lf%lf",&rec[i].t,&rec[i].x);
34         sort(rec,rec+n,cmp);
35         double ans = 0;
36         for(int i = 1;i < n;++i)
37         ans = Max(ans,Fabs(rec[i].x-rec[i-1].x) / (rec[i].t - rec[i-1].t));
38         printf("Case #%d: %.2lf\n",kase++,ans);
39     }
40     return 0;
41 }