I got this question in a company's coding round:

Find the minimum cost to make all the elements of an array equal, when 2 operations can be performed-

1. Increment an element by 1 which costs 'a' units
2. Decrement an element by 1 which costs 'b' units

Constraints:

Array size <= 10^5

a,b <= 10^5

0 <= element <= 10^6