Input：N， M， D， p， S(i,j)=λjρ(λi,λj)

Output：

Set A contains the label assigned to the channel by the classical channel

Set U contains the label assigned to the channel by the quantum channel

c=+∞

for t in size-N subsets of ｛1，2，…，D｝

y=∑j∈tSj:

I=sort（y）

s=sum（y）

if s<c and max（y）<p then

c=s

A= First M elements in I

U=t

end if

end for