InterviewBit Problems   Valid BST from Preorder : Unsolved

About the Valid BST from Preorder : Unsolved category (1)
Example test-case should be 0 (2)
A Simple stack based solution (1)
Better explanation of algorithm (1)
Worth more than 100 (1)
Given wrong sample test ans (1)
Wrong ans helppp! (1)
Wrong output example (1)
Wrong example output (3)
O(n) Solution easiest (6)
O(n) solution is giving TLE, what am I missing in this? (1)
Incorrect sample test case (1)
Difficulty of question is way beyond 100 marks (2)
Timme limit exceeded! (1)
Example output given is wrong (7)
Before solving,remove duplicates from the given vector to get the correct answer (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)
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)