Check for BST Problem

#1


The code provided by pratik bhaiya doesnt work when the tree is not BST
for the input 2 3 7 1 6 8 -1
it shows the tree is BST but it is not BST what modification should be made in the code so that it works for both the condition

#2

You are making a bst through build function so ans will always be yes

#3

But how can we check the tree is not a BST

#4

@mohitshendre2609 just make a tree not using bst method to check