Can you solve this equation?

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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
2100-4
Sample Output
1.6152No solution!
#include<iostream>#include<cmath>#include<cstdio>using namespace std;double l,h,mid,y;double run(double x){    return 8*pow(x,4)+7*pow(x,3)+2*pow(x,2)+3*x+6;}int main(){    int T;    cin>>T;    while(T--)    {        cin>>y;        l=0;h=100;        while(l+1e-8<h)        {            mid=(l+h)/2;            if(run(mid)>y) h=mid;            else l=mid;        }        if (l==0||h==100) cout<<"No solution!"<<endl;        else printf("%.4lf\n",l);    }    return 0;}