无线网络覆盖 郑州大学第三届acm比赛试题 n 199

 题不难，分好各种情况后再写，一个分类讨论的问题没带优盘，保存一下

#include<stdio.h>

#include<math.h>



int main()

{

    int T, length, wide, radius, dia;

    scanf("%d", &T);

    while(T--)

    {

         scanf("%d%d%d", &length, &wide, &radius);

         dia = 2 * radius;

         if(dia <= wide)

             printf("impossible\n");

         else

         {

             double len=sqrt((dia*dia - wide*wide));

             if((len - length) > 0.0)

                      printf("1\n");

             else

             {

                 if(len-1.0 < 0.00001)

                     printf("impossible\n");

                 else

                 {

                     int num;

                     double fnum;

                     fnum = (double)length/len;

                     num = ceil(fnum);

                     printf("%d\n", num);

                 }

                 

             }

             

         }

    }

    return 0;

}