Round one:
1.Whether a Binary tree is BST or not . Write code for it taking O(1) space complexity .
2.Reverse a linked list. Iterative and recursive both.
3.Given an arrray with n elements give a pair of numbers such that sum will be equal to a number K.

Question

Round one:
1.Whether a Binary tree is BST or not . Write code for it taking O(1) space complexity .
2.Reverse a linked list. Iterative and recursive both.
3.Given an arrray with n elements give a pair of numbers such that sum will be equal to a number K.

Anonymous · Accepted Answer

For first one, I said to do Inorder traversal and check whether it is sorted or not.
One thing, read geeksforgeeks very carefully.

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