{"id":"iterative-reversal-O1-space","text":"`reverse_list` uses exactly three local pointer variables (`prev`, `curr`, `next_node`) regardless of list length, making it O(1) auxiliary space.","truth_value":"IN","source":"entries/2026/06/06/reverse-linked-list-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":["o1-space-via-running-accumulators"],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"iterative-reversal-O1-space","truth_value":"IN","reason":"premise"}]}}