Hi,
I have 2 list of class A, is there a STL algorithm which find out if
there is equal element between them (using == operator of A)?
Thank you.
3  1806 
On 2006-02-24, Al************@ gmail.com <Al************ @gmail.com> wrote: Hi,
I have 2 list of class A, is there a STL algorithm which find out if
there is equal element between them (using == operator of A)?
Thank you.
std::sort the lists and use std::set_inters ection to create a
list of common elements.
--
Neil Cerutti
Cheer up, Freddy. You've got the best part in the picture. And
you, Anna. You've got the best part, too! --Samuel Goldwyn
<Al************ @gmail.com> wrote in message
news:11******** *************@j 33g2000cwa.goog legroups.com... I have 2 list of class A, is there a STL algorithm which find out if
there is equal element between them (using == operator of A)?
If the only comparison operator available is ==, then anything you do is
going to be slow because you have to compare all pairs of elements from the
two lists. You can use the find_first_of algorithm to do those comparisons.
If you have an order relation such as < available, there are other
algorithms, typically involving sorting, that will answer your question more
quickly on average. If you tell us what operations are available, we may be
able to suggest a strategy.
Neil Cerutti wrote: On 2006-02-24, Al************@ gmail.com <Al************ @gmail.com> wrote: Hi,
I have 2 list of class A, is there a STL algorithm which find out if
there is equal element between them (using == operator of A)?
Thank you.
std::sort the lists and use std::set_inters ection to create a
list of common elements.
That assumes an operator<. You could also assume a function int
hash(A);
that could reduce the complexity to O(1).
HTH,
Michiel Salters This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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