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Find middle element in circular linked list

A circular linked list is a type of linked list where the last node of the list points to the first node, forming a loop. To find the middle element in a circular linked list, you need to traverse the list and keep track of two pointers, a slow pointer and a fast pointer.

The slow pointer moves one node at a time, while the fast pointer moves two nodes at a time. When the fast pointer reaches the end of the list, the slow pointer will be pointing to the middle element of the list.

However, there is a special case where the list has an even number of elements, and in this case, the "middle" element would be the second of the two central elements. To handle this case, you can choose to either return the first or the second of the central elements as the "middle" element.

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