., C++ (gcc) - rextester

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//g++  7.4.0
#include <iostream>
 #include <fstream>
 #include <cmath>
 #include <string>
 #include <vector>
 #include <random>
 using namespace std;

int main()
 {

vector<double>v={42.5,
36.7 ,
36.15,
36.65,
38.3 ,
39.7 ,
41.3 ,
43.3 ,
44.9 ,
46.85,
48.8 ,
50.6 ,
52.5 ,
54.45,
56.25,
58.3 ,
60.2 ,
62.15,
64.2 ,
66.15,
68.1 ,
70   ,
71.95};
vector<double>w(v.size());

for(int i=0;i<v.size();i++)
    {
    w[i]=v[i]-8;
    cout<<w[i];
    cout<<endl;
    }
    
	 return 0;
}

#include <iostream>
 #include <fstream>
 #include <cmath>
 #include <string>
 #include <vector>
 #include <random>
 using namespace std;

double ChiQuadro(vector<double> Yi,vector<double> ErrY, vector<double> Xi,double a,double b);

int main()
 {
    char Ans;
    cout << "Chi Quadro?" <<endl;
    cin >> Ans;
    
    vector<double> Dati;
    vector<double> Errori;
    ifstream yin("Y.txt");
    ifstream ein("Errori.txt");
    double sum=0;
    double c1,c2;
    while(yin >> c1) 
     {
     	//c1=2*M_PI/c1;
        Dati.push_back(c1);
        sum+=c1;
     }
     while(ein >> c2) 
     {
        Errori.push_back(c2);
     }
     sum=sum/Dati.size();
     double dev=0;
     for(int i=0; i<Dati.size(); i++){
     	dev+=pow(sum-Dati[i],2);
	 }
	 dev=sqrt(dev/(Dati.size()-1));
	 cout << " media : " << sum << endl;
	 cout << " dev : " << dev << endl;
	 
	 double unosusig2=0;
	 double medpes=0;
	 double ErrEmed=0;
		 
		 for (int i=0; i<Dati.size(); i++){  	//Media pesata 
		 	medpes+=Dati[i]/pow(Errori[i],2);
		 	unosusig2+=1/pow(Errori[i],2);
		 	
		 }
		 medpes=medpes/unosusig2;
		 ErrEmed=sqrt(1/unosusig2);
		 
	//cout << " media pesata : " << medpes << endl;
	//cout << " errore media pesata : " << ErrEmed << endl;
	cout << "$ "<< medpes <<"\\pm " << ErrEmed << "$ &" <<endl;
	
	
	if(Ans=='y'){
		ifstream xin("X.txt");
		double a,b;
		cout<< "inserire a e b";
		cin >> a;
	    cin >> b;
	    vector<double> X;
	    double j;
	    while (xin >> j){
			X.push_back(j);
		}
	    
		cout << ChiQuadro(Dati, Errori,X,a,b)<< endl;
		cout << "Gradi di libertà : "<< Dati.size()-2<< endl;
	}
		 
	 return 0;
}

double ChiQuadro(vector<double> Yi,vector<double> ErrY, vector<double> Xi,double a,double b){
	
	double Yattesa,Chi;
	for(int i=0; i<Yi.size(); i++){
		
		//Yattesa=a*exp(Xi[i]);  //inserire funzione interpolante
		Yattesa=a+b*Xi[i];
		Chi+=pow((Yi[i]-Yattesa)/ErrY[i],2);
		
	}
	
	return Chi;
}

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Compilation time: 0.93 sec, absolute running time: 0.18 sec, cpu time: 0.01 sec, memory peak: 5 Mb, absolute service time: 1,21 sec