24 Jul
2008
24 Jul
'08
3:40 p.m.
Nicolas, your initials fits you ;)
nice and twice quicker as the bit-sift one.
You have one messsage #combinations:atATimeDo: to enumerate partitions, but in SequenceableCollection, not in Set:
| collec subset | collec := 1 to: 4. subset := OrderedCollection new: (2 raisedTo: collec size). subset add: #(). 1 to: collec size do: [:subSize | collec combinations: subSize atATimeDo: [:subArray | subset add: subArray copy]]. subset
Mind the copy, because the iteration recycle same subArray for economy.
I'dnevertheless prefer a name like: #combinationsSize:do:
Cédrick