Can you solve this equation

Problem Description

Now,given the equation 8*x^4 + 7*x^3 + 2*x^2 + 3*x + 6 == Y,can you find its solution between 0 and 100;
Now please try your lucky.

Input

The first line of the input contains an integer T(1<=T<=100) which means the number of test cases. Then T lines follow, each line has a real number Y (fabs(Y) <= 1e10);

Output

For each test case, you should just output one real number(accurate up to 4 decimal places),which is the solution of the equation,or “No solution!”,if there is no solution for the equation between 0 and 100.

Sample Input

2
100
-4

Sample Output

1.6152
No solution!
#include<iostream>
#include<math.h>
#include<stdio.h>
using namespace std;
#define num 807020306
double cal(double x)
{
 return 8*x*x*x*x+7*x*x*x+2*x*x+3*x+6;
}
double y;
double gcd(double head,double rear)
{
 double mid;
 while(rear-head>1.0e-7)
 {
   mid=(head+rear)/2;
  if(cal(mid)<y) head=mid;
  else rear=mid;
 }
    return rear;
}
int main()
{
 int t;
 scanf("%d",&t);
 while(t--)
 {
  scanf("%lf",&y);
        if(y<6||y>num) cout<<"No solution!"<<endl;
     else printf("%.4lf\n",gcd(0.0,100.0));
 }
 return 0;
}