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Yet one more coin sorting problem (Posted on 2004-05-31) Difficulty: 3 of 5
You have five coins, apparently alike, but actually of different weights. You also have a two arm scale.

Can you manage to sort the coins in ascending order, using the scale only seven times?

Bonus question: can it be done in fewer weighings?

See The Solution Submitted by Federico Kereki    
Rating: 4.0000 (4 votes)

Comments: ( Back to comment list | You must be logged in to post comments.)
re(7): Solution based on the O-Sort sorting algorithm Comment 20 of 20 |
(In reply to re(6): Solution based on the O-Sort sorting algorithm by Erik O.)

Your link has a missing / between computer and sortroutines (in the visible verions it has a backslash there, but in the actual link there's nothing there).

I did find that even .81 failed to sort completely, so I doubt .78 would work either.

Of course one could guarantee that it would work if when it reached the step-1 level, that if it found it necessary to swap anything it would go through the step-1 level again, and so on until no swaps were made.

  Posted by Charlie on 2004-06-03 22:38:11
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