Question

Figure below is a balanced binary tree. If a node inserted as child of the node R, how many nodes will become unbalanced?

(a) 2

(b) 1

(c) 3

(d) 0

The origin of the question is Binary Trees topic in chapter Binary Trees of Data Structures & Algorithms I

This question was addressed to me by my college director while I was bunking the class.

Answer 1

Right option is (b) 1

To explain: Only the node P will become unbalanced, with balance factor +2.