{"id":"counter-all-pattern","text":"divide-array-into-equal-pairs uses `Counter` + `all()` with a generator expression — `all()` short-circuits on the first odd count, giving O(n) time and O(k) space.","truth_value":"IN","source":"entries/2026/06/06/divide-array-into-equal-pairs-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"counter-all-pattern","truth_value":"IN","reason":"premise"}]}}