How to correctly delete 2d array with known second dimension size?

Question

My array:

int (*arr)[100] = new int[100][100];

How should I correctly delete this?

edit: I know how delete works, but i am not sure if I should delete it like this

delete[] arr;

or like this

for(int i = 0; i < 100; i++) {
    delete[] arr[i];
}
delete[] arr;

Answer 1

A simple delete[] arr; should do just fine.

Whether you are freeing new int[100][100][100][100] or new int[100] you use delete[] x; . If it's a single object, you use delete x; .