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Tagged with queue

2 cards

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 Easy O(1)

Wrap a `deque` inside a small class so enqueue uses `append`, dequeue uses `popleft`, and peek reads the leftmost item without removing it.

Implement a queue with enqueue, dequeue, and peek operations.

#collections #python #queue