i enconter a question about: operator = overloading

Question

I have got some trouble in learning c++. The code below I can complie, but run crash when i debug (the picture I poste), but I can find the true problem of the code. The compile tools I use is dev++.

The doubt point is memcpy(array,ar.getArray(),r*c*sizeof(array[0][0])); because some guy tell me it is shallow copy not deep copy, in fact, what I want to do is to copy the value not the address.

Erorr:

Code:

#include<iostream>
#include<cstdlib>
using namespace std;
class Array2 {
    
    private:
        int r;
        int c;
        int **array;
    public:
        Array2 (){
            cout<<"no character constructor"<<endl;
            //k=1;
        }
        Array2 (int row,int colume);  
        ~Array2()
        {
            if(array)
            {               
                cout<<"deconstructor called!"<<endl;
                for(int i=0;i<r;++i)
                {
                    delete [] array[i];
                }
                delete [] array;
                                
            } 
    
        }
        int * operator [] (int & i);
        int & operator () (int & i,int & j); 
        Array2 & operator = ( Array2 & ar);

        void setR(int row){
            r=row;
        }
        void setC(int colume){
            c=colume;
        }
                
        int getR()  {
            return r;
        }
        int getC()  {
            return c;
        }
        int** getArray()    {
            return array;
        }                           
};
Array2 & Array2::  operator = ( Array2 & ar){   
    cout<<"= character constructor"<<endl;
    r=ar.getC();
    c=ar.getR();
    array=new int*[r*c];
    for(int i=0;i<r;i++){
        array[i]=new int[c];
    }
    memcpy(array,ar.getArray(),r*c*sizeof(array[0][0]));    
    return *this;   
}

int & Array2:: operator () (int & i,int & j){
    return array[i][j];
}   

int *  Array2:: operator [] (int & i){
    //return a[i];
    return array[i];
}


Array2:: Array2(int row,int colume ):r(row),c(colume)
{   
    cout<<" character constructor"<<endl;
    array=new int*[r];
    for(int i=0;i<r;i++){
        array[i]=new int[c];
    }
    
}
int main()
{
    Array2 a(3,4);
    int i,j;
    for(i=0;i<3;++i)
    {
        for(j=0;j<4;j++)
        {
            a[i][j]=i*4+j;
        }
    }
    for(i=0;i<3;++i)
    {
        for(j=0;j<4;++j)
            cout<<a(i,j)<<",";
        cout<<endl;
    }
    cout<<"next"<<endl; 

    Array2 b;
    Array2 c(3,4);
    b=a;
    for(i=0;i<3;++i)
    {
        for(j=0;j<4;++j)
            cout<<b(i,j)<<",";
    cout<<endl;
    }   
    
    if(&a==&b)
        cout<<"a and b adress is the same"<<endl;
    else
    {
        cout<<"a and b adress is not the same"<<endl;
        cout<<"a:"<<a.getArray()<<","<<"b:"<<b.getArray()<<endl;        
    }

    if(&a!=&c)
        cout<<"a and c adress is not the same"<<endl;
    cout<<"a:"<<a.getArray()<<","<<"c:"<<c.getArray()<<endl;
    return 0;   
}