Can you solve this equation?

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)

Total Submission(s): 19065    Accepted Submission(s): 8406

Problem Description

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

2 100 -4

 

Sample Output

1.6152 No solution!

 

Author

Redow

思路：二分解方程。

# include 
     
      # include 
      
       double fun(double x){    return 8*x*x*x*x + 7*x*x*x + 2*x*x + 3*x + 6;}int main(){    int t;    double y, l, r;    scanf("%d",&t);    while(t--)    {        scanf("%lf",&y);        if(y
       
        fun(100))        {            puts("No solution!");            continue;        }        l = 0;        r = 100;        double mid = (l+r)/2;        while(fabs(fun(mid)-y)>1e-6)        {            if(fun(mid)