Big Fucking Gauss' Gun

#include <iostream>
#include <ctime>
#include <cstdlib>
#include <cstdio>
#include <math.h>

using namespace std;

void wypisz(double**,int);

int main(){
    cout.precision(16);
    int n;
    cout<<"podaj n"<<endl;
    cin>>n;
    cout << endl;
    double **tab;
    double *A;

    time_t now;
    time(&now);
    srand((unsigned int)now);

    tab=new double*[n];
    for (int i=0;i<n;i++){
        tab[i]=new double[n+1];
    }
    A=new double[n];
    for(int i=0; i<n; i++){
        //A[i]=pow(2.0f, rand()%10);
        //A[i]=rand()%20-10;
        A[i]=rand()/101.931;
        cout << A[i] << endl;
    }
    for (int i=0;i<n;i++){
        double temp=0;
        for (int j=0;j<n;j++){
            //tab[i][j]=pow(2.0f, rand()%10);
            //tab[i][j]=rand()%20-10;
            tab[i][j]=rand()/49.001;
            temp+=tab[i][j]*A[j];
        }
        tab[i][n]=temp;
    }
    for(int y=0; y<n; y++){
        double mnoznik=1/tab[y][y];
        for (int x=y;x<n+1;x++){
            tab[y][x]*=mnoznik;
        }
        for(int w=y+1; w<n; w++){
            double mnoznik=tab[w][y]/tab[y][y];
            for(int x=0; x<n+1; x++){
                tab[w][x]-=tab[y][x]*mnoznik;
            }
        }
    }
    for(int y=n-1; y>=0; y--){
        for(int w=y-1; w>=0; w--){
            tab[w][n]-=tab[y][n]*tab[w][y];
            tab[w][y]=0;
        }
    }
    cout << endl << endl;
    for(int i=0; i<n; i++)
        cout << tab[i][n] << endl;
    return 0;
}

void wypisz(double **tab, int n){
    cout<<endl;
    for (int i=0;i<n;i++){
        for (int j=0;j<n+1;j++){
            cout<<tab[i][j]<<"  ";
        }
        cout<<endl;
    }
}