{"id":"treenode-redefined-per-problem","text":"`TreeNode` is defined locally in each tree problem's `solution.py` rather than imported from a shared module, matching LeetCode's submission format and keeping each problem directory self-contained","truth_value":"IN","source":"entries/2026/06/06/range-sum-of-bst-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"treenode-redefined-per-problem","truth_value":"IN","reason":"premise"}]}}