InterviewBit Problems   Valid BST from Preorder : Unsolved

About the Valid BST from Preorder : Unsolved category (1)
Example output given is wrong (7)
Before solving,remove duplicates from the given vector to get the correct answer (1)
Difficulty of question is way beyond 100 marks (1)
Tackling repeat values in the tree (1)
Wrong Example / Test case Given (1)
All preorder values will be distinct (1)
Even the complete solution is wrong! (1)
Logic behind the problem (1)
Given Sample Test Case in the Example is wrong (1)
The sample output is correct (3)
Heads up, guys. Before Solving please read (1)
Wrong example output (2)
Points should be more for this question (1)
Yes Its Wrong The Expected Output is 0 with Sample Test Case (1)
Wrong sample input (1)