When we encounter a number in array which is neither of the 2 majority elements we reduce count of both.
Suppose we get element 2 while traversing the array …then why don’t we reduce the count of element 1. It is reducing the majority of element 1.
Doubt in algorithm
Hey @vishakha_narang
Do a dry run on some small example
You will understand why we are not doing that 
We are keepingtrack of possible majority elements
So when 2nd element comes it does not mean majority of 1st element decrease .