#include <iostream>
#include <iomanip>
#include <vector>
using namespace std;

double stuAve(vector<double> v) {
    double s = 0;
    for (int i = 0; i < v.size(); i++)
        s += v[i];
    s /= v.size();
    return s;
}

double* courseAve(vector<vector<double>> v) {
    double* a = new double[v[0].size()];
    for (int i = 0; i < v.size(); i++) {
        for (int j = 0; j < v[0].size(); j++)
            a[j] += v[i][j];
    }
    for (int j = 0; j < v[0].size(); j++)
        a[j] /= v.size();
    return a;
}

int main(){
	vector<vector<double>> v = {
	    {80.0, 70.0, 90.0},
        {85.0, 77.0, 95.0},
        {83.0, 75.0, 70.0},
        {73.0, 95.0, 67.0},
        {88.0, 79.0, 71.0}
	};
	cout << fixed << setprecision(1);
	for (int i = 0; i < v.size(); i++) {
	    for (int j = 0; j < v[i].size(); j++)
	        cout << v[i][j] << ", ";
        cout << stuAve(v[i]) << endl;
	}
	double* ave = courseAve(v);
	cout << "Average: " << ave[0];
	for (int i = 1; i < v[0].size(); i++) {
	    cout << ", " << ave[i];
	}
	system("pause");
	return 0;
}