what about this one
//the record 43 WA!!!!!
#include <string>
#include <vector>
#include <cstdio>
#include <cmath>
#include <algorithm>
#include <iostream>
#include <sstream>
using namespace std;
long double f1(long double p,long double q,long double r,long double s,long double t
,long double u,long double x)
{
return ( p*exp(-1*x)+ q*sin(x) + r*cos(x) + s*tan(x) + t*x*x + u );
}
/*long double f(long double p,long double q,long double r,long double s,long double t
,long double u,long double a
,long double b)
{
return (b-(((b-a)*f1(p,q,r,s,t,u,b))/(f1(p,q,r,s,t,u,b)-f1(p,q,r,s,t,u,a))));
}*/
void main()
{
int p1,q1,r1,s1,t1,u1;
long double a=0,b=1,c=0;
int g=0;
while(cin>>p1>>q1>>r1>>s1>>t1>>u1)
{
g=0;
long double p=p1,q=q1,r=r1,s=s1,t=t1,u=u1;
a=0;
b=1;
c=0;
long double f1a,f1b,f1c,c1=999999999;
f1a=f1(p,q,r,s,t,u,a);
f1b=f1(p,q,r,s,t,u,b);
while(1)
{
//f1a=f1(p,q,r,s,t,u,a);
//f1b=f1(p,q,r,s,t,u,b);
if(f1a*f1b>0)
{
cout<<"No solution"<<endl;
break;
}
if(f1a==0)
{
//a+=0.005;
printf("%.4f\n",a);
g=0;
break;
}
if(f1b==0)
{
//b+=0.005;
printf("%.4f\n",b);
g=0;
break;
}
//c=f(p,q,r,s,t,u,a,b);
//c1=c;
c=(b+a)/2;
f1c=f1(p,q,r,s,t,u,c);
if(f1a*f1c<0)
{
b=c;
f1b=f1c;
}
if(f1b*f1c<0)
{
a=c;
f1a=f1c;
}
//f1c=f1(p,q,r,s,t,u,c);
if(f1c==0 ||abs(f1c-c1)<0.00001)
{
//c+=0.005;
printf("%.4f\n",c);
g=0;
break;
}
c1=f1c;
g++;
}
}
}[/code]
.
.
