110. Balanced Binary Tree

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Given a binary tree, determine if it is height-balanced. Example 1: Input: root = [3,9,20,null,null,15,7] Output: true Example 2: Input: root = [1,2,2,3,3,null,null,4,4] Output: false Example 3: Input: root = [] Output: true Constraints: - The number of nodes in the tree is in the range [0, 5000]. - -104 <= Node.val <= 104

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solution.cppC++17

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