LeetCode 104. Maximum Depth of Binary Tree - Interview Prep Ep 65

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LeetCode 104. Maximum Depth of Binary Tree: leetcode.com/p...
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Solutions explained:
Recursive solution: We'll add one to each level before traversing to its left and right children, return zero when the current node is null.
Iterative solution: We can use two extra data structures to help us mimic what happens when the recursive program runs, one is the stack that holds the tree nodes that we'll iterate on, the other is the depths of each of the node.
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