The function removeAt of the class arrayListType removes an element from the list by shifting the elements of the list. However, if the element to be removed is at the beginning of the list and the list is fairly large, it could take a lot of computer time. Because the list elements are in no particular order, you could simply remove the element by swapping the last element of the list with the item to be removed and reducing the length of the list. Rewrite the definition of the function removeAt using this technique.
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