{"id":"concat-array-no-mutation","text":"The concatenation solution uses Python's `+` operator on lists, which always allocates a new list; the input `nums` is never modified.","truth_value":"IN","source":"entries/2026/06/06/concatenation-of-array-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"concat-array-no-mutation","truth_value":"IN","reason":"premise"}]}}