{"id":"find-difference-xor-no-extra-space","text":"`findTheDifference` uses O(1) auxiliary space — the generator feeding `reduce` is lazy, so no list or counter is materialized.","truth_value":"IN","source":"entries/2026/06/06/find-the-difference-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"find-difference-xor-no-extra-space","truth_value":"IN","reason":"premise"}]}}