Re: STL list unique elements efficiency
On 20 Sep., 08:23, Kannan <riderc...@gmail.com> wrote:
Hi,
I have a question about efficiency of some combination of STL
functions. By efficiency I mean faster, memory consumption is not a
problem for my application.
For the list container to create a list with unique elements, is it
more efficient to do a find() if not found then push_back() Or
push_back() anyway then do a sort() followed by unique() ?
That depends on the data. If you e.g. have one million elements of
which there are only ten unique, find will be faster; if there are
900000 unique elements, the sort will be fastest.
Most likely, list is not a good choice - prefer std::vector or
std::set.
Another question, when I am doing a find() on a list container, is
there any efficiency advantage if the list has unique only elements?
The only advantage is that there might be fewer elements to search,
but whether this matters depends on the application.
/Peter
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