{"id":"second-minimum-root-is-global-min","text":"In the special binary tree for LeetCode 671, `root.val` is always the global minimum due to the structural invariant that every parent's value equals the minimum of its children.","truth_value":"IN","source":"entries/2026/06/06/second-minimum-node-in-a-binary-tree-solution.md","source_url":"","source_hash":"","justifications":[],"dependents":[],"metadata":{},"created_at":"","updated_at":"","reviewed_at":"","verified_at":"","retracted_at":"","explanation":{"steps":[{"node":"second-minimum-root-is-global-min","truth_value":"IN","reason":"premise"}]}}