Submission #1190398

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Source Code Expand

#include<iostream>
#include<cmath>
#include<iomanip>
using namespace std;
const double p=3.1415926535897932384626;
const double EPS=1e-11;
double a,b,c;
double f(double t)
{
	return a*t+b*sin(c*t*p);
}
main()
{
	double x=0.0,y=250.0;
	cin>>a>>b>>c;
	for(int i=0;i<1000;i++)
	{
		double m=(x+y)/2;
		double s=f(m);
		if(s>100-EPS&&s<100+EPS)
		{
			cout<<fixed<<setprecision(9)<<m<<endl;
			return 0;
		}
		else if(s>=100+b)y=m;
		else if(s<=100-b)x=m;
		else if(s>=100)
		{
			y=m;
		}
		else
		{
			x=m;
		}
	}
	cout<<fixed<<setprecision(9)<<x<<endl;
}

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