HDU 2199 二分

//By BLADEVIL
#include <cstdio>
#include <iostream>

using namespace std;

double f(double x) {
    return (8*x*x*x*x+7*x*x*x+2*x*x+3*x+6);
}

int task,y;

int main() {
    scanf("%d",&task);
    double left=f(0),right=f(100);
    while (task--) {
        cin>>y;
        //printf("%.4f ",y);
        if ((y<left)||(y>right)) {
            printf("No solution!\n");
            continue;
        }
        double l=0,r=100,ans;
        for (int i=1;i<=30;i++) {
            double mid=(l+r)/2;
            if (f(mid)>y) {
                ans=mid;
                r=mid-1;
            } else l=mid+1;
        }
        printf("%.4f\n",ans);
    }
    return 0;
}