C 1 , C 2 , ⋯ , C m
α 1 , α 2 , ⋯ , α m
B’s level total sorted P × C
{ P 1 P 2 ⋮ P n
{ b 11 , b 12 , ⋯ , b 1 m b 21 , b 22 , ⋯ , b 2 m ⋮ b n 1 , b n 2 , ⋯ , b n n
{ ∑ j = 1 m α j b 1 j = b 1 ∑ j = 1 m α j b 2 j = b 2 ⋮ ∑ j = 1 m α j b n j = b n