Answered: write a python function that will…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

See similar textbooks

Related questions

Question

write a python function that will return the leaves of a binary tree with (t) being the root of the binary tree. the function must use recursion

Starting code:

def leaves(t):

return [t.key]

Expert Solution

Step 1: Explanation

TreeNode Class:
- A TreeNode class is defined to represent nodes in the binary tree. Each TreeNode object has three attributes:
  - key: The value stored in the node.
  - left: A reference to the left child node.
  - right: A reference to the right child node.
The leaves Function:
- The leaves function takes a single argument, t, which represents the root of the binary tree.
Base Case:
- The function begins with a base case check. If the input node t is None, it means the tree is empty, and an empty list is returned since there are no leaves in an empty tree.
Checking for Leaf Nodes:
- If t is not None, the function checks whether t is a leaf node by examining its left and right children.
- If both the left and right children are None, it means t has no children, and it is a leaf node. In this case, a list containing the value of the leaf node (t.key) is returned.
Recursion:
- If t is not a leaf node, the function proceeds to recursively find leaves in both the left and right subtrees.
- The left subtree is explored by calling leaves(t.left), and the right subtree is explored by calling leaves(t.right).
Combining Leaves:
- The leaves obtained from the left and right subtrees are combined into a single list using the + operator, and this combined list is returned as the result for the current subtree.

Step by step

Solved in 3 steps with 2 images

SEE SOLUTION Check out a sample Q&A here

Knowledge Booster

Learn more about

Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, computer-science and related others by exploring similar questions and additional content below.

Similar questions