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Sep 10, 2016 at 4:50 vote accept TMS
Sep 9, 2016 at 22:54 comment added TMS hi @Eugene, your suggestion looks very promising. I will try it and report the results.
Sep 9, 2016 at 22:17 comment added Eugene @TMS Please see the edit above
Sep 9, 2016 at 22:17 history edited Eugene CC BY-SA 3.0
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Sep 9, 2016 at 22:04 comment added TMS Thank you for your reply Unfortunately, I have the worst case. but there's a special property I forgot to mention: $c^+_i$ is always larger than $c^-_i$ in my problem. and yes, searching $2^n$ is too expensive to me.
Sep 9, 2016 at 21:41 history edited Eugene CC BY-SA 3.0
added 249 characters in body
Sep 9, 2016 at 21:32 history answered Eugene CC BY-SA 3.0