After giving this some thought, I realized that traditional permutation generators are going to have a problem here. Consider the following four permutations:

11100
11100
11100
11100

[download]

Those can be different permutations. The second could have the first and second ones swapped, the third could have the last fourth and fifth zeroes swapped, etc. Even though, to us, they look the same, the permutators that I've played with don't see that (and how would they calculate it?).

And it was an interesting coincidence to see the Knuth thread on /. this morning. I'm checking it out now.

Cheers,
Ovid

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In reply to Re: Re (5): Puzzle: need a more general algorithm by Ovid
in thread Puzzle: need a more general algorithm by Ovid

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