无线网络覆盖 郑州大学第三届acm比赛试题 n 199

#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;
}