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How do you allocate memory for a 2D array using pointers in C++?

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How do you allocate memory for a 2D array using pointers in C++?

int *arr = new int[2][2];

int arr[2][2];

int *arr = new int[2]; for(int i = 0; i < 2; ++i) arr[i] = new int[2];

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int **arr = new int[2][2];

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