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Re^4: rand + shift || popby JavaFan (Canon) |
on Dec 21, 2010 at 16:41 UTC ( [id://878302]=note: print w/replies, xml ) | Need Help?? |
Actually, the expected running time of splicing is Ω(n), as a random splice will have to move n/4 elements on average.
If you want to repeatedly get a random element (without duplication), shuffle the array and use pop or shift, for a linear running time. Repeatedly splicing a random element has an expected running time of Ω(n2).
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