Nhap mang 2 chieu bang ham

#include <iostream>
#include <iomanip>
#include <cstdlib>
#include <fstream>
#define INP "input.INP"
using namespace std;

int **input1(int &n)
{
    int **G;
    ifstream inp(INP);
    if (inp == NULL)
    {
        cout<<"Khong thay file input";
        return NULL;
    }
    inp >> n ;
    G = new int *[n];
    for (int i=0; i<n; i++)
    {
        G[i] = new int [n];
        for (int j=0; j<n; j++)
            inp >> G[i][j];
    }
    return G;
}

void input2(int ***G, int &n)
{
    ifstream inp(INP);
    if (inp == NULL)
    {
        cout<<"Khong thay file input";
        return;
    }
    inp >> n ;
    *G = new int *[n];
    for (int i=0; i<n; i++)
    {
        (*G)[i] = new int [n];
        for (int j=0; j<n; j++)
            inp >> (*G)[i][j];
    }
}

void input3(int **(&G), int &n)
{
    ifstream inp(INP);
    if (inp == NULL)
    {
        cout<<"Khong thay file input";
        return;
    }
    inp >> n ;
    G = new int *[n];
    for (int i=0; i<n; i++)
    {
        G[i] = new int [n];
        for (int j=0; j<n; j++)
            inp >> G[i][j];
    }
}

void output(int **G, int n)
{
    for (int i=0; i<n; i++)
    {
        cout<<endl;
        for (int j=0; j<n; j++)
            cout<<setw(2)<<G[i][j];
    }
}

int main()
{
    int **G, n;
    input3(G,n);
    output(G,n);

    system("pause");
    return 0;
}