PreOrder Traversal Binary Tree - Hacker Rank Explained in simplest way in Java
Full Binary Tree: Every node (besides children) has exactly 2 children (the maximum children a node can have in a binary tree).
Complete Binary Tree: Every level, except possibly the last, is completely filled, and all nodes are as far left as possible.
Perfect Binary Tree: All interior nodes have two children and all leaves have the same depth or same level. Perfect binary trees are both full and complete.
Preorder Traversal: node left right
Inorder Traversal: left node right
Postorder Traversal: left right node
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