ZZU_2 简单的无线网络覆盖

 1 #include<stdio.h>
 2 #include<stdlib.h>
 3 #include<math.h>
 4 
 5 int main()
 6 {
 7     int i, ncases；

       double l, d, r,n, num, k;
 9    
10     while(scanf("%d",&ncases) != EOF)
11     {
12        for(i=0; i<ncases; i++)                       
13        {
14           scanf("%d%d%d",&l, &d, &r);                                    
15           if(r <= d/2) 
16              printf("impossible\n");
17           else
18           {
19             s = sqrt(r*r-(d/2)*(d/2)); 
21             num = l/(s*2);

               k = floor(num);
22             if(k < num)
23                printf("%d\n", (int)k + 1);
24             else
25                printf("%d\n", (int)k); 
26           }
27        }
28     } 
29     return 0;
30 }