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Coding Exercises Medium O(n)

Use a queue, process nodes in batches equal to the current queue size, and collect their children for the next level.

Return the nodes of a binary tree level by level.

#bfs #python #queue #tree

Coding Exercises Medium O(n)

Write a DFS helper that appends the current node before, between, or after visiting children depending on which traversal you are building.

Return the inorder, preorder, and postorder traversals of a binary tree.

#dfs #python #tree