What is the output of the following code snippet?class Node: def __init__(self, value): self.data = value self.left = None self.right = Nonedef count_leaves(node): if node is None: return 0 if node.left is None and node.right is None: return 1 return count_leaves(node.left) + count_leaves(node.right)# Usage example:root = Node(1)root.left = Node(2)root.right = Node(3)root.left.left = Node(4)root.left.right = Node(5)root.right.left = Node(6)print(count_leaves(root))Options1234
Question
What is the output of the following code snippet?class Node: def init(self, value): self.data = value self.left = None self.right = Nonedef count_leaves(node): if node is None: return 0 if node.left is None and node.right is None: return 1 return count_leaves(node.left) + count_leaves(node.right)# Usage example:root = Node(1)root.left = Node(2)root.right = Node(3)root.left.left = Node(4)root.left.right = Node(5)root.right.left = Node(6)print(count_leaves(root))Options1234
Solution
The output of the given code snippet will be 3.
Here's the step by step explanation:
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The given code defines a class
Nodewith a constructor that initializes a node with a value and two children nodes - left and right, both of which are initially set to None. -
The function
count_leaves(node)is defined to count the number of leaf nodes in a binary tree. A leaf node is a node that has no children. -
If the node is None, it returns 0 because there are no nodes in the tree.
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If the node has no children (both left and right are None), it returns 1 because it's a leaf node.
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If the node has children, it recursively counts the leaf nodes in the left and right subtrees and returns the sum.
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A binary tree is created with the root node having a value of 1. The root node has two children - left child with value 2 and right child with value 3. The left child of the root node has two children - left child with value 4 and right child with value 5. The right child of the root node has one child - left child with value 6.
-
The
count_leaves(root)function is called with the root node of the tree as the argument and the result is printed. -
The leaf nodes in the tree are the nodes with values 4, 5, and 6. So, the output of the code will be 3.
Similar Questions
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