BuildBST code doubt

#1

codelink :https://ide.codingblocks.com/s/182963
I am unable to understand where I am having invalid pointers as I am getting garbage value in output please correct it

#2

Hey just a small mistake

for(int i = 0; i < n; i++){
cin>>a[i];
}
node *root = NULL;
root = buildBst(0, n-1, a, root);
printPreOrder(root);

u did not close the for loop before calling the function

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#3

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