104. Maximum Depth of Binary Tree

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Given the root of a binary tree, return its maximum depth. A binary tree's maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Example 1: Input: root = [3,9,20,null,null,15,7] Output: 3 Example 2: Input: root = [1,null,2] Output: 2 Constraints: - The number of nodes in the tree is in the range [0, 104]. - -100 <= Node.val <= 10

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solution.cppC++17

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