Question: Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down

Given a binary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest leaf node. Note: A leaf is a node with no children. Example: Given binary tree (3,9,20, null, null, 15,7] , 3 9 20 11 15 7 return its depth = 3
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