Problem 2735. Binary Neighbourhood

Created by Jan Orwat

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Given a natural number reorder its binary form to create another number, closest to the given one.

Examples:

1 gives 2, ( 1(dec) > 1 > 01 > 10 > 2(dec) )
2 gives 1, ( 2(dec) > 10 > 01 > 1(dec) )
5 gives 6, ( 5(dec) > 101 > 110 > 6(dec) )

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239 Solutions
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Last Solution submitted on Jan 06, 2026

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3 Comments

3 Comments

Alfonso Nieto-Castanon on 19 Jan 2015

one perhpas "unfair" issue with this scoring system is that it penalizes strings by their length (e.g. unique(...,'sorted') costs more points than unique(...,'rows')) which encourages attempting to avoid strings all together...

Jan Orwat on 19 Jan 2015

That's good point. Thanks for your involvement Alfonso. I will disable this feature. I thought it's right approach to count strings like that but your argument shows there are many exceptions, so... not a good idea.

Alfonso Nieto-Castanon on 23 Jan 2015

but I liked your fix for the ans trick, I wish that was part of the standard cody scoring!

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