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I have a vector<int>* arr, which is actually a 2D array.
arr = new vector<int> [size];
Is it ok that I just do
delete arr;
Will arr[i] be automatically be deleted, since it is a standard vector?
No, you should be using
delete[]when you usednew[].But this is madness. You’re using nice happy friendly containers for one dimension, then undoing all the goodness by resorting to manual dynamic allocation for the outer dimension.
Instead, just use a
std::vector<std::vector<int> >, or flatten the two dimensions into a single vector.