{"id":"solution-files-self-contain-treenode","text":"Each tree problem redefines `TreeNode` (or `Node`) locally rather than importing from a shared module, so every solution is independently runnable.","truth_value":"IN","source":"entries/2026/06/06/maximum-depth-of-binary-tree-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"solution-files-self-contain-treenode","truth_value":"IN","reason":"premise"}]}}