Can you solve this equation?

Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 13674    Accepted Submission(s): 6086

#include <iostream> #include <cmath> #include <iomanip> const double p = 0.000001; using namespace std; double calculate(double x,double Y) {     return 8*pow(x,4)+7*pow(x,3)+2*pow(x,2)+3*x+6;        } double lookup(double left,double right,double Y) {  double mid;         while(right - left > p)   //二分查找         {             mid = (right+left)/2.0;             if(calculate(mid,Y) > Y) right = mid;             else left = mid;         }         return mid;      } int main() {  int T;  double Y,right,left;  cin>>T;  while(T--) {  cin>>Y;  left = 0; right = 100;         if(calculate(left,Y) > Y || calculate(right,Y) <Y)         {             cout<<"No solution!"<<endl;             continue;         }         else        cout<<setiosflags(ios::fixed)<<setprecision(4)<<lookup( left,right, Y)<<endl; } }

Can you solve this equation?

原文：http://www.cnblogs.com/yangyuhang/p/4934472.html