athttp://en.wikipedia.org/wiki/Knuth%27s_Algorithm_X in the example I don't understand that why not "A" is in the final solution whereas "A" was selected at Level 1

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anonymous · Answer

@TuringTest any clue?

anonymous · Answer

I believe that this question is on-topic in our computer science group.

anonymous · Answer

yap its a computer science algorithm

anonymous · Answer

hey dude just go through the example its self explanatory.

anonymous · Answer

@annas if I had understood it then I won't have bothered to post it here

anonymous · Answer

http://www.cs.mcgill.ca/~aassaf9/python/algorithm_x.html it will help