function?seq=arithintdecod（btagalphacntlgt）?
CC（1）=0;?
for?i=1:length（cnt）?
????CC（i+1）=CC（i）+cnt（i）;?
end?
totcount=CC（i+1）;?
m=ceil（log2（totcount*4））;?
seq=‘‘;?
l=0;?
u=2^m-1;?
for?i=1:lgt?
????ts=btag（1:m）;?
????t=bin2dec（ts）;?
????k=1;?
????s=floor（（（t-l+1）*totcount-1）/（u-l+1））;?
????while（s>=CC（k））?
????????k=k+1;?
????end?
????????seq=[seq?alpha（k-1）];?
????????l1=l+floor（（（u-l+1）*CC（k-1））/totcount）;?
????????u=l+floor（（（u-l+1）*CC（k））/totcount）-1;?
????????l=l1;?
???????lb=dec2bin（lm）;?
???????ub=dec2bin（um）;?
???????E2=1;E3=1;?
???????while?（E2?|?E3）?
?????????fbl=lb（1）;?
?????????fbu=ub（1）;?
??????????if?fbl==fbu?
??????????????E2=1;?
?????????????lb（1）=‘‘;?