{"id":"leetcode-solution-class-convention","text":"Every problem directory contains a `solution.py` with a `Solution` class exposing a single public method, following LeetCode's standard interface pattern.","truth_value":"IN","source":"entries/2026/06/06/a-number-after-a-double-reversal-solution.md, entries/2026/06/06/add-digits-solution.md, 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":"leetcode-solution-class-convention","truth_value":"IN","reason":"premise"}]}}