{"id":"self-contained-solution-with-local-treenode","text":"Each tree problem defines its own `TreeNode` class locally rather than importing from a shared module, making each problem directory independently runnable","truth_value":"IN","source":"entries/2026/06/06/subtree-of-another-tree-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":["duplication-cost-free-when-implementations-correct"],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"self-contained-solution-with-local-treenode","truth_value":"IN","reason":"premise"}]}}