{"id":"canformarray-distinctness-required","text":"The `{p[0]: p for p in pieces}` lookup strategy is only correct because the problem guarantees all integers across all pieces are distinct; duplicate first elements would silently overwrite entries.","truth_value":"IN","source":"entries/2026/06/06/check-array-formation-through-concatenation-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"canformarray-distinctness-required","truth_value":"IN","reason":"premise"}]}}