{"id":"lcp-vertical-scan","text":"`longest_common_prefix` scans characters column-by-column across all strings (vertical scanning), not by comparing pairs of strings sequentially","truth_value":"IN","source":"entries/2026/06/06/longest-common-prefix-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"lcp-vertical-scan","truth_value":"IN","reason":"premise"}]}}