Preorder, Inorder and Postorder in 5 minute | Tree Traversal | Easiest and Shortest Trick 

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Pre-order traversal while duplicating nodes and values can make a complete duplicate of a binary tree. It can also be used to make a prefix expression (Polish notation) from expression trees: traverse the expression tree pre-orderly.
In-order traversal is very commonly used in binary search trees because it returns values from the underlying set in order, according to the comparator that set up the binary search tree (hence the name).
Post-order traversal while deleting or freeing nodes and values can delete or free an entire binary tree. It can also generate a postfix representation of a binary tree
0:00 - Introduction
1:35 - Complete the given tree
2:23 - Basic technique
2:54 - Solution with example
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