Medium Accuracy: 40.86%
Submissions: 1537 Points: 4
Given a preorder traversal of a BST, find the leaf nodes of the tree without building the tree.
Example 1:
Input:
N = 2
arr = {2,1}
Output: {1}
Explaination: 1 is the only leaf node.
Example 2:
Input:
N = 3
Arr = {3, 2, 4}
Output: {2, 4}
Explaination: 2, 4 are the leaf nodes.
Your Task:
You don't need to read input or print anything. Your task is to complete the function leafNodes() which takes the array arr[] and its size N as input parameters and returns the leaf nodes of the tree.
Expected Time Complexity: O(N) Expected Auxiliary Space: O(N)
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Avoid using static/global variables in coding problems as your code is tested
against multiple test cases and these tend to retain their previous values.
Passing the Sample/Custom Test cases in coding problems does not guarantee the
correctness of code. On submission, your code is tested against multiple test cases
consisting of all possible corner cases and stress constraints.
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