Algorithm 1 Correlation Clustering Algorithm

Require: V, E+, E−     H ← ∅   while V ≠ ∅ do    C ← ∅    V’ ← ∅    Pick a random pivot i ∈ V    C ← {i}    for j ∈ V and j ≠ i do     if j, i ∈ E+ then      Add j to C     end if     if j, i ∈ E− then      Add j to V’     end if    end for    V ← V’    Add C to H   end while   return H