2
100
-4

1.6152
No solution!
 
 
AC_code:
#include<stdio.h>
#include<math.h>
double f(double x)
{
	return 8*x*x*x*x+ 7*x*x*x + 2*x*x + 3*x + 6; 
}
int main()
{
	int n;
	double y,mid,l,r;
	scanf("%d",&n);
	while(n--)
	{
		scanf("%lf",&y);
		if(y<f(0)||y>f(100))
			printf("No solution!\n");
		else
		{
			l=0;r=100;
			while(r-l>1e-10)
			{
				mid=(r+l)/2;
				 if(f(mid)<y)
					l=mid+1e-10;
				else
					r=mid-1e-10;
			}
			printf("%.4lf\n",mid);
		}
	}
	return 0;
}