Then, the cover value of the set S is defined as cov(S) = u∈S min(cov(u, S), 0.25cov(u, U )).
3 the final coverage function is: g(S) = w(S) + α B∈B |S ∩ B| 1/2 + β D∈D |S ∩ D| 1/2 + λcov(S), where α, β, λ are non-negative constants.