java - searching an unorder list without converting it to an array -


Is there a way to search the object in a linked list of objects in a way? I thought that you just have a sort of sorting and a binary search? Thanks

This is not a good way, IMO if you type Collections.sort (list) < / Code>, where a list is a linkededlist , it templates a temporary array that copies it to list , And then copy it to the O (NlogN) plus 2 * O (N) copies, but when you type a binary search (like Collections.binarySearch (list) , try copying Every search is done by O (N) list traversal operation. Well sorting list is not bothered!

Another way to convert an array into an array or an ArrayList , And then search the sort and array / ArrayList. It gives a copy to set up in a way, and o (login) for every search.

But none of these is the best way. It depends on how often you search Connection can.

  • If you just want to do a search on the list, then list.contains (...) to O (N) Calling. ..and that's better than sorting and binary search.

  • If you want to search for a list at any time, you probably create a list of entries in HashSet. The HashSet build is O (N) and the search is O (1) . (It assumes that you do not need your balance sheet.)

  • If you want to do multiple searches on that list, the order changes, where the order is not important, Change the list will be O (1) and O (1) for each addition / removal to increase the cost of updating HSSAT for every search with a hashet.

  • If you want to do multiple searches on that list that keeps changing and the order is important, replace the listing with the entry-indexed LinkedHashMap. For each search, it will be O (1) and O (1) to add / delete it ... but with a large constant proportionality compared to a hashet.


Comments

Post a Comment

Popular posts from this blog

sql - dynamically varied number of conditions in the 'where' statement using LINQ -

I am using my first project LINQ (in mvc), so maybe there's something very simple that I remember. However, a day of searching and experimenting does not work, so it works. I am trying to write a LINQ query (Linux to SQL) in which in many cases where the statement is different from an OR or an AND. We do not know how many conditions are going in the query till runtime. This search is for filter control, where the user can choose multiple criteria for filtering. Select from table where table.col = 1 or table.col = 2 or table.col = 7 .... 'Other number of conditions Before I just create the SQL query as a string, while looping over all the situations. However, it seems that there should be a good way to do this in LINQ. I tried to use Expression trees, but they had a second thought for this moment on my head, where the lambda function was to be executed inside the statement such as: values ​​for matchingRows = matchingRows for each value Where (function (row) row.c...
Read more

asp.net mvc - Dynamically Generated Ajax.BeginForm -

I have a problem with ASP.NET MVC Ajax forms. I generate many Ajax form in a table such as: & Lt; Input type = "submit" name = "activity" value = "add activity" / & gt; & Lt;%}% & gt; & Lt; / TD & gt; & Lt; / TR & gt; & Lt;%}% & gt; So far so good. When I post one of those forms, it gives a partial view in a div, and in this new partial view a new Ajax Beginnform (which is not in Genesis form) This second Ajax Beginnorf is exactly like the ones I got on the table, but when I post it, I do not get the "Ajax Post", but a normal post that sends me to a new page, I do not know whether the two Ajax forms What is the reason for the difference between, why is it the "dynamically generated" Ajax form behaves like a normal HTML form? By the way, I know that I can do it in different ways using javascript, but I would like to understand whether it can only be done using MVC helplars and Ajax lib...
Read more

Debug on symbian -

I am using trk for phone debug This works well for the Holorld project But when I start the project in phone debug mode 1) the load failed 2) TrkProtocolPlugin: to target the specified file Failure (please verify If any body understands what problem I am experiencing, then this problem helps me Pre-release If the application has the privileges assigned (with the appropriate certificate) itemprop = "text" > In your case, I will check: / li> If there is no conflict of application ID with any other application of device If there are problematic commands in the installation package (for example copy copy for non-accessible directories)
Read more