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No suppose we have a(T1,T2) and b(T3,T4) as 2 BSTs with a and b as roots and Ti's as child BSTs.
- Himanshu July 13, 2012Now suppose b is less than a then b is inserted somewhere in T1. Now if we just add T3 and T4 below b in T1 maybe an element of T4 could come that is greater than a which would violate the BST property