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Nov 12, 2012 at 18:13 vote accept Misch
Nov 12, 2012 at 13:59 comment added Evgeny Kluev @Knaģis: I agree, this may be optimized as you suggested.
Nov 12, 2012 at 13:58 history edited Evgeny Kluev CC BY-SA 3.0
added 331 characters in body
Nov 12, 2012 at 13:46 comment added Knaģis you should optimize somehow so that the queue does not get filled with duplicates (for example, {1,0,0,0} and {0,1,0,0} can both produce {1,1,0,0} at step 5).
Nov 12, 2012 at 13:28 history answered Evgeny Kluev CC BY-SA 3.0