Binary tree are the tree where one node can have only two child and cannot have more than two.
Level order traversal of a binary tree.
Level order traversal means that we visit the nodes level by level. Like for below tree the level order traversal will be
Its Level order traversal will be
1 2 3 4 5
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Here is the code for doing that.
class Node: def __init__(self,data): self.left = None self.right = None self.data = data def level_order(queue): if len(queue) == 0: return node = queue queue.pop(0) if node.left: queue.append(node.left) if node.right: queue.append(node.right) print node.data level_order(queue) queue = list() root = Node(1) queue.append(root) root.left = Node(2) root.right = Node(3) root.left.left = Node(4) root.left.right = Node(5) level__order(queue) # 1 2 3 4 5
What we did here:
We make use of queues to do the level order traversal. What we did is we visit a node and put its left and right child in the queue and delete the current node. In this way we visit the tree in level order.
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Algorithms and Data Structures.
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