Leaderboard
Showing:
Preorder Traversal and BST
Medium Accuracy: 61.65% Submissions: 417 Points: 4

Given an array arr[ ] of size N, write a program that returns 1 if given array can represent preorder traversal of a possible BST, else returns 0.

Example 1:

Input:
N = 3
arr = {2, 4, 3}
Output: 1
Explaination: Given arr[] can represent
preorder traversal of following BST:
               2
                \
                 4
                /
               3

Example 2:

Input:
N = 3
Arr = {2, 4, 1}
Output: 0
Explaination: Given arr[] cannot represent
preorder traversal of a BST.

Your Task:
You don't need to read input or print anything. Your task is to complete the function canRepresentBST() which takes the array arr[] and its size as input parameters and returns 1 if given array can represent preorder traversal of a BST, else returns 0.

Expected Time Complexity: O(N)
Expected Auxiliary Space: O(N)

Constraints:
1 ≤ N ≤ 103
1 ≤ arr[i] ≤ 103

to report an issue on this page.

Editorial

We strongly recommend solving this problem on your own before viewing its editorial. Do you still want to view the editorial?

Yes

All Submissions

My Submissions:

Login to access your submissions.

Preorder Traversal and BST

Output Window