1 //二分查找
2 #include<stdio.h>
3 #include<math.h>
4 #define eps 1e-7
5 double fun(double x)
6 {
7 return 8*pow(x,4)+7*pow(x,3)+2*pow(x,2)+3*x+6;
8 }
9 double bin_search(double Y)
10 {
11 double low=0.0,high=100.0,mid;
12 while(high-low>eps)
13 {
14 mid=(low+high)/2.0;
15 if(fun(mid)<Y)
16 low=mid+eps;
17 else
18 high=mid-eps;
19 }
20 return (low+high)/2;
21 }
22 int main()
23 {
24 int t;
25 double Y,ans;
26 scanf("%d",&t);
27 while(t--)
28 {
29 scanf("%lf",&Y);
30 if(fun(0)<=Y&&Y<=fun(100))
31 {
32 ans=bin_search(Y);
33 printf("%.4lf\n",ans);
34 }
35 else
36 printf("No solution!\n");
37 }
38 return 0;
39 }
