Validate BST Problem Statement
Given a binary tree with N
nodes, determine whether the tree is a Binary Search Tree (BST). If it is a BST, return true
; otherwise, return false
.
A binary search tree (BST) is a binary tree with the following properties:
- The left subtree of a node contains only nodes with data less than the node's data.
- The right subtree of a node contains only nodes with data greater than the node's data.
- Both the left and right subtrees must also be binary search trees.
Input:
The first line contains an integer t
, indicating the number of test cases. Each test case consists of a single line containing the elements of the tree in level order form separated by a single space. If any node does not have a left or right child, use -1
in its place.
Output:
For each test case, return true
if the binary tree is a BST, otherwise return false
. Output for each test case should be in a separate line.
Example:
Input:
1
1 2 3 4 -1 5 6 -1 7 -1 -1 -1 -1 -1 -1
Output:
true
Explanation:
The given input corresponds to a tree where each node satisfies the properties of a BST.
Constraints:
1 <= T <= 100
1 <= N <= 1000
-106 <= data <= 106
Where N
is the number of nodes in the tree, T
represents the number of test cases, and data
denotes the data contained in each node of the binary tree.
Note:
You do not need to print anything explicitly. The implementation handles printing the result for each test case.
AnswerBot
2d
Validate if a binary tree is a Binary Search Tree (BST) based on given properties.
Check if the left subtree of a node contains only nodes with data less than the node's data.
Verify if the right subtre...read more
Help your peers!
Add answer anonymously...
Top Google Software Developer Intern interview questions & answers
Popular interview questions of Software Developer Intern
Top HR questions asked in Google Software Developer Intern
Stay ahead in your career. Get AmbitionBox app
Helping over 1 Crore job seekers every month in choosing their right fit company
65 L+
Reviews
4 L+
Interviews
4 Cr+
Salaries
1 Cr+
Users/Month
Contribute to help millions
Get AmbitionBox app