{"id":"destcity-set-difference-approach","text":"destCity solves the terminal-city problem via set membership — builds a set of source cities, then finds the first destination absent from it — avoiding graph construction entirely.","truth_value":"IN","source":"entries/2026/06/06/destination-city-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"destcity-set-difference-approach","truth_value":"IN","reason":"premise"}]}}