On 3/30/13 4:09 PM, Gary McConnell wrote:
So I understand something of what is going on, could you please tell me why the tuple thing is necessary for the "used" set but the vectors are necessary for the "bases": ie why can we not use a vector structure for "used"?
The bases is just a list of lists of vectors, which doesn't require immutability. The used variable is a set (since set membership testing is O(1), but list membership testing is O(n)---a lot slower). A set requires immutability.
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