Print the left view of a binary tree.

To print the left view of a binary tree, I would first clarify the definition of the 'left view' and handle edge cases like an empty tree. A common and efficient approach is to use a Level Order Traversal (Breadth-First Search). By iterating through the tree level by level using a queue, the first node encountered at each level represents the leftmost node for that level. Therefore, we simply print the value of the first node dequeued at the start of processing each new level. This method ensures that we capture the leftmost node from top to bottom. The time complexity is O(N) as each node is visited once, and the space complexity is O(W), where W is the maximum width of the tree, due to the queue.