Algorithm help per favore

[Erik Max Francis]

Matt Shomphe wrote:

> I think this may be faster than calling enumerate() repeatedly.

Unlikely, since you're only calling enumerate once.  `for x in seq'
evaluates seq once and then iterates over it; it doesn't evaluate seq
each time through the loop.  Indeed, enumerate was introduced precisely
to obviate the need for indexing over lists of indices and mapping those
to the original sequence.

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