[Retros] At-home initial array challenge

Noam Elkies elkies at math.harvard.edu
Sun Mar 20 16:49:53 EST 2005

I wrote:

>> I was lucky -- the third thing I tried worked [...]

Francois Labelle responded:

> Congratulations! [...]

Thanks! :-)

>> P.S. Clearly it couldn't have been in 6.5 or 7.0 moves...

> I suspected that something like that was true, but was afraid

> to get it wrong which would have inadvertently added a hint.

> (16+x) type can only be of length odd.5 or even.0

> (x+16) type can only be of length even.0 or even.5

> So clearly length odd.0 is impossible, but how can you dismiss

> length 6.5 quickly? I think that you got it wrong!

Indeed I did, sorry. At any rate 7.0 is impossible.


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