// ConsoleApplication1.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <iostream>
#include <cmath>

using namespace std;

int main()
{
/*	int n;
	cout << "n=" << endl;
cin >> n; */
	int n = 4;
	double a[4][5] = { {1,2,3,2,-1},{-1,2,2,1,0} ,{2,4,-2,2,4} ,{-1,3,2,2,0} };
	for (int k = 0; k < n; k++)
	{
		int max = a[k][k];
	//	cout << a[k][k] << endl;
		int r = k;
		for (int i = 0; i < n; i++)
		{

			if (abs(a[i][k])>abs(max)) {
				max = a[i][k];
				r = i;
			}
		}
		if (max == 0) {
			cout << " Macierz układu osobliwa" << endl;
		}
		for (int j = k; j < n+1 ; j++) {
			a[k][j] = a[r][j];
		//	cout << a[k][j] << endl;
		}
		for (int j = k; j < n+1; j++)
		{
			a[k][j] = a[k][j] / max;
			cout << k << j << endl;
			cout << a[k][j] << endl;
		}
		for (int i = 1; i < n; i++) {
			if (i == k) {
				continue;
			}
			for (int j = k; j < n+1; j++)
			{
				a[i][j] = a[i][j] - a[i][k] * a[k][j];
			}
		}

	}
	for (int i = 1; i < 4; i++)
	{
		for (int j = 1; i < 5; i++)
		{
			cout << a[i][j] << endl;
		}
	}

	system("pause");
    return 0;

}