Time Limit: 1000MS Memory Limit: 10000K
Total Submissions: 52274 Accepted: 214

  本题非常简单，就是求第n年的时候半径r>sqrt(x*x+y*y);

代码：

 

 1 #include<stdio.h>
 2 #include<math.h>
 3  #define pr acos(-1.0) //这个我也是听别人说的，一定要记得
 4  int main()
 5 {
 6     int n,m;double r1,r2,x,y;
 7     while(scanf("%d",&n)!=EOF)
 8     {
 9         int i;
10         for(i=1;i<=n;i++)
11         {
12             scanf("%lf%lf",&x,&y);
13             r2=0;
14             r1=x*x+y*y;
15             m=0;
16             while(r2<r1)
17             {
18                 m++;
19                 r2=m*50*2/pr;
20             }
21             printf("Property %d: This property will begin eroding in year %d.\n",i,m);
22         }
23         printf("END OF OUTPUT.\n");
24     }
25     return 0;
26 }
27 
28 
29