Code gives preorder traversal as 4 2 3 5 6, which is also perfectly fine as it’s for a different BST with the same array elements.
Multiple binary search trees can be made from a single array
@Arpan_Goswami in this question you have to build bst normally like first one is root . then small goes left and bigger right (as taught in the start)
hope its clear if yes dont forget to hit like and mark resolved 
Can you share the code for the build tree, according to me if we construct the tree like the way you said it will always be a skewed tree.
We had null pointers as -1 in the videos shown
@Arpan_Goswami yes it will become skewed if sorted array given but i think input output is acc to that only
here refer insert function in this
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