二分法解具有单调性的方程

解方程的手段有很多，如二分法、牛顿迭代法等等，本次介绍的是采用二分法，在使用二分法解方程时，有一点应该特别注意，就是那种“具有单调性”的函数才可以，否则是会有问题的

** HDU 2199**
Problem Description
Now,given the equation 8x^4 + 7x^3 + 2x^2 + 3x + 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!

题目地址

#include <iostream>
#include<math.h>
#include<