{"id":"add-strings-avoids-int-conversion","text":"`addStrings` converts between characters and digit values using `ord()/chr()` arithmetic (`ord(c) - 48`, `chr(d + 48)`) and never calls `int()` or `str()`, satisfying the problem's constraint against built-in integer conversion.","truth_value":"IN","source":"entries/2026/06/06/add-strings-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"add-strings-avoids-int-conversion","truth_value":"IN","reason":"premise"}]}}