Level order Traversal of a rooted Tree can be done by starting from root and…

Core idea: Level-order traversal visits nodes level by level starting from the root. Implement it using breadth-first search (BFS) with a queue (FIFO).

Algorithm (queue-based):

1. Enqueue the root node (if it exists).

2. While the queue is not empty:

3. Dequeue the front node and visit it; then enqueue all of its children in order (typically left to right).

Pseudo-code: queue = new Queue(); if (root != null) queue.enqueue(root); while (!queue.isEmpty()) { node = queue.dequeue(); visit(node); for each child of node: queue.enqueue(child); }

Time complexity: O(n), where n is the number of nodes (each node is enqueued and dequeued once).

Space complexity: O(n) in the worst case (the queue may hold an entire level of the tree, which can be proportional to n).