[HDOJ3424]Range

水题，群起而水之~

#include <cstdio>
 2 
 3 usingnamespace std;
 4 
 5 int main()
 6 {
 7 double tmpx,tmpy;
 8 double x,y,px,py;
 9 while (scanf("%lf %lf",&px,&py) ==2)
10     {
11         tmpx =0;
12         tmpy =0;
13 if (px ==-1&& py ==-1) break;
14 while (scanf("%lf %lf",&x,&y) ==2)
15         {
16 if (x ==0&& y ==0) break;
17 if (y < py)
18             {
19                 tmpx += x - px;
20                 tmpy += py - y;
21             }
22             px = x;
23             py = y;
24         }
25         printf("%.0lf\n",py * tmpx / tmpy);
26     }
27 return0;
28 }