{"id":"flood-fill-four-directional","text":"Flood fill connectivity is 4-directional (up/down/left/right); diagonal pixels are never considered neighbors.","truth_value":"IN","source":"entries/2026/06/06/flood-fill-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"flood-fill-four-directional","truth_value":"IN","reason":"premise"}]}}