C++ :: How To Return Address Of Dynamic Matrix

How can i returns the address of the matrix.

The Question : Complete the following function that takes 2 integers m and n as parameters. The function defines a dynamic matrix of integers of size mXn, fills the matrix with information from the KB, then returns the address of the matrix.

Note: DO NOT forget to put the returned datatype in the given space(………….)
………………………. allocate (int m, int n) { }

My solution :

int allocate (int m, int n){
cin>>n>>m;
int **a;
a=new int *a[n];
for (int i =0; i<n; i++)
a[i] = new int[m];
for (int i=0; i<n ; i++)
for (int J=0; j<m ; j++)
cin >> a[i][j];
}