Maximum OR Sum

For an array $A$ of length $N$, let $f(A)$ denote the [bitwise OR](https://en.wikipedia.org/wiki/Bitwise_operation#OR) of the elements of $A$. That is, $f(A) = (A_1 \mid A_2 \mid\ldots\mid A_N)$, where $\mid$ denotes bitwise OR. For a fixed parameter $M$, we then define $\text{score}(A, M)$ as follows: - You can perform the following operation *at most once* on $A$: - Choose two indices $L$