Can someone give me a hint on this problem: http://www.spoj.com/problems/PT07A/. I cannot figure out how to calculate the SG numbers.
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I did some research — you can use the colon principle, but not sure how.
I also found this http://www.cs.cmu.edu/afs/cs/academic/class/15859-f01/www/notes/hack.html. :)