easyBlind 75
Maximum Depth of Binary Tree
Return the maximum depth of a binary tree Example: [3,9,20,null,null,15,7] => 3
Maximum Depth of Binary Tree rewards clean traversal structure more than any clever shortcut. It's a great warm-up that builds traversal modeling without a ton of moving parts. The trap is revisiting states or missing a base case; your visited/queue logic needs to be tight.
BFS / DFSTrees
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1Maximum Depth of Binary Treeeasy
2Part 2
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