Linked Lists medium time O(n) space O(1)
Reverse a Linked List
Take nodes off the front of the original list one at a time and put each on the front of a new list. Because each node goes to the front, the order comes out reversed — and no extra nodes are ever created.
Reverse by moving each node from the front of the list to the front of a new one.
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Practice
Machine twin: /dsa-viz-v2/linked-list-reverse.json — the full deterministic run as structured data.