Set Major (Prefix)

**This is the easy version of the problem. The only difference with the easy version is that here, you need to only count the number of prefixes of the given array that are dominating - all constraints and definitions otherwise remain the same. This problem is worth $100$ points in divisions $2, 3,$ and $4$, and is not scored in division $1$.** An array $B$ of length $M$ is said to be *dominati