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- I recommend that you pick up an introductory computer science book to learn stuff things like Big O notation and basic data structures and algorithms. The biggest performance benefits comes from choosing the right algorithm and data structures; you're doomed to write suboptimal code if you don't have a good grasp of the basics in computer science.Staffan– Staffan2010-07-07 23:19:57 +00:00Commented Jul 7, 2010 at 23:19
- Lookup on a sorted list is O(lg N). Lookup on a map is supposed to be O(1), not O(lg N), though it degrades if your hash function causes collisions.Ben Voigt– Ben Voigt2010-07-07 23:38:54 +00:00Commented Jul 7, 2010 at 23:38
- For a hash map look-up time is amortized O(1), yes. For a std::map it's O(log n). See e.g. this sgi.com/tech/stl/SortedAssociativeContainer.htmlStaffan– Staffan2010-07-07 23:51:20 +00:00Commented Jul 7, 2010 at 23:51
- I know about the different lookup speeds maps and vectos are suposed to have. They are the reason why i asked my question in the first place, since i didn't understand why the map lookup seemed to perform worse.sum1stolemyname– sum1stolemyname2010-07-08 05:37:26 +00:00Commented Jul 8, 2010 at 5:37
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