Python Binary Search Tree: Create a Balanced Binary Search Tree (BST) using an sorted array
Python Binary Search Tree: Exercise-1 with Solution
Write a Python program to create a Balanced Binary Search Tree (BST) using an array (given) elements where array elements are sorted in ascending order.
Pictorial Presentation:
Sample Solution:
Python Code:
class TreeNode(object):
def __init__(self, x):
self.val = x
self.left = None
self.right = None
def sorted_array_to_bst(nums):
if not nums:
return None
mid_val = len(nums)//2
node = TreeNode(nums[mid_val])
node.left = sorted_array_to_bst(nums[:mid_val])
node.right = sorted_array_to_bst(nums[mid_val+1:])
return node
def preOrder(node):
if not node:
return
print(node.val)
preOrder(node.left)
preOrder(node.right)
result = sorted_array_to_bst([1, 2, 3, 4, 5, 6, 7])
preOrder(result)
Sample Output:
4 2 1 3 6 5 7
Flowchart:
Python Code Editor:
Contribute your code and comments through Disqus.
Previous: Binary Tree Home.
Next: Write a Python program to find the closest value of a given target value in a given non-empty Binary Search Tree (BST) of unique values.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.
Python: Tips of the Day
Find current directory and file's directory:
To get the full path to the directory a Python file is contained in, write this in that file:
import os dir_path = os.path.dirname(os.path.realpath(__file__))
(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)
To get the current working directory use
import os cwd = os.getcwd()
Documentation references for the modules, constants and functions used above:
- The os and os.path modules.
- The __file__ constant
- os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
- os.path.dirname(path) (returns "the directory name of pathname path")
- os.getcwd() (returns "a string representing the current working directory")
- os.chdir(path) ("change the current working directory to path")
Ref: https://bit.ly/3fy0R6m
- New Content published on w3resource:
- HTML-CSS Practical: Exercises, Practice, Solution
- Java Regular Expression: Exercises, Practice, Solution
- Scala Programming Exercises, Practice, Solution
- Python Itertools exercises
- Python Numpy exercises
- Python GeoPy Package exercises
- Python Pandas exercises
- Python nltk exercises
- Python BeautifulSoup exercises
- Form Template
- Composer - PHP Package Manager
- PHPUnit - PHP Testing
- Laravel - PHP Framework
- Angular - JavaScript Framework
- Vue - JavaScript Framework
- Jest - JavaScript Testing Framework