1 #include <iostream> 2 #include <cstdio> 3 #include <cmath> 4 #define sc(x) scanf("%d",&(x)) 5 #define pf(x) printf("%.4lf ", x) 6 using namespace std; 7 int T; 8 double Y; 9 double r(double x) 10 { 11 return (8*pow(x, 4) + 7*pow(x, 3) + 2*pow(x, 2) + 3*x + 6); 12 } 13 double Find() 14 { 15 double front = 0, rear = 100, mid; 16 while((rear - front) > 1e-6) 17 { 18 mid = (front + rear) / 2; 19 if(r(mid) < Y) 20 front = mid + 1e-7; 21 else 22 rear = mid - 1e-7; 23 } 24 return (front + rear) / 2; 25 } 26 int main() 27 { 28 sc(T); 29 while(T--) 30 { 31 cin >> Y; 32 if(r(0) <= Y && Y <= r(100)) 33 pf(Find()); 34 else 35 cout << "No solution!" << endl; 36 } 37 return 0; 38 }