Tail Controls The Ring
A tail pointer gives direct access to both the last node and head through tail.next.
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Circular operations update a ring where tail.next points back to head, so insertions and deletions must preserve the cycle.
A tail pointer gives direct access to both the last node and head through tail.next.
New nodes can join the end by pointing to head, then becoming the new tail.
Deleting head means changing tail.next to the next node.
Traversal stops when the cursor returns to the starting node.