The `add_to_head` method in the `DoublyLinkedList` class is used to add a new node to the beginning of the doubly linked list. This method takes an input value and creates a new node with that value. It then updates the necessary pointers to make the new node the new head of the list. If the list was empty before adding the new node, the new node becomes both the head and the tail of the list. This method has a time complexity of O(1) as it only requires a constant amount of operations to add the new node to the head of the list.
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