Reflection Disorder

Suppose $B$ is an array of length $M$. We define the *reflection* of $B$ as follows: - For each $i$ such that $1 \le i \lt M+1-i$, swap the $i$-th largest and $(M+1-i)$-th largest elements of $B$. That is, the *reflection* of $B$ is obtained by swapping its largest element with its smallest element, its second largest element with its second smallest, and so on. For example, if $B = [3, 5, 8