using System;
using static System.Math;
using static System.Console;
class main{
static void Main(){
	double R=0.8;
	Func<vector,double> f=(v)=>{
		v.print();
		if(v%v<R)return 1;else return 0;
		};
	double exact=PI/4*R*R;
	double[] a={0,0};
	double[] b={1,1};
	int N=(int)2e4;
	double[] r;
	//r = plainmc.integrate(f,a,b,N:N);
	//Write($"integ={r[0]}\n");
	//Write($"error={r[1]}\n");
	r = strata.integrate(f,a,b,N:N);
	Error.Write($"integ={r[0]} ");
	Error.Write($"sigma={r[1]}\n");
	Error.Write($"exact={exact} ");
	Error.Write($"error={Abs(exact-r[0])}\n");
}//Main
}//main