GreyMaster's blog

Need help
By GreyMaster, history, 9 years ago, In English

Hello.

I need a little help about set data structure. Is it possible that access the i-th element of a set with O(1) ?

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9 years ago, # |
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First of all, you cannot access an element of a std::set with less complexity than O(log(n)). And also you cannot access the i-th element of a set. But you can do this with a little trick.

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    9 years ago, # ^ |
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    Thank you. But I know before that it is possible to accsess the i-th element with O(n) .So is there no work to acsess the i-th element with O(log n)?

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      9 years ago, # ^ |
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      unfortunately no. I don't know why they didn't make this feature although it was easy to be done

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