{"id":"contains-duplicate-greedy-update","text":"Unconditionally overwriting `last_seen[num] = i` after each check is correct because any future occurrence at index `m > i` will be closer to `i` than to any earlier index — older occurrences can never produce a shorter distance.","truth_value":"IN","source":"entries/2026/06/06/contains-duplicate-ii-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"contains-duplicate-greedy-update","truth_value":"IN","reason":"premise"}]}}