1 #include <iostream>

 2 #include <stdio.h>

 3 #include <math.h>

 4 using namespace std;

 5 double y;

 6 double func(double x)

 7 {

 8     return 8*pow(x,4)+7*pow(x,3)+2*pow(x,2)+3*x+6;

 9 }

10 int main()

11 {

12     int t;

13     double left,right,mid,ans1,ans2,ans3;

14     cin>>t;

15     while(t--)

16     {

17         cin>>y;

18         if(func(0)>y||func(100)<y)

19         cout<<"No solution!"<<endl;

20         else

21         {

22             left = 0.0;

23             right = 100.0;

24             mid = 50.0;

25             ans1 = func(left)-y;

26             ans2 = func(mid)-y;

27             ans3 = func(right)-y;

28             while(fabs(ans1-ans2)>0.0001)

29             {

30                 if(ans2>0)

31                 {

32                     right = mid;

33                     ans3 = ans2;

34                     mid = (left+right)/2;

35                 }else

36                 {

37                     left = mid;

38                     ans1 = ans2;

39                     mid = (left+right);

40                 }

41                 ans2 = func(mid)-y;

42             }

43             printf("%.4f\n",mid);

44         }

45     }

46     return 0;

47 }