Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

List<> shuffle

Posted on 2009-05-12
2
558 Views
Last Modified: 2013-12-17
I have a Generic List (List<>). How is best to shuffle it? (randomize its items)
0
Comment
Question by:johnkainn
2 Comments
 
LVL 22

Expert Comment

by:p_davis
ID: 24366491
maybe add a property on your object that is a random number and then sort the list by that.
0
 
LVL 37

Accepted Solution

by:
gregoryyoung earned 250 total points
ID: 24366613
that would take the time of the sort ...

you could randomize it in linear time by just removing/adding the node at a random spot.

for(int i=0;i<list.length;i++) {
int newIndex = (int) Random.Next * SizeOfList - 1;
list.RemoveAt(i);
list.InsertAt(newIndex);
}

Cheers,

Greg
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Many of us here at EE write code. Many of us write exceptional code; just as many of us write exception-prone code. As we all should know, exceptions are a mechanism for handling errors which are typically out of our control. From database errors, t…
Today I had a very interesting conundrum that had to get solved quickly. Needless to say, it wasn't resolved quickly because when we needed it we were very rushed, but as soon as the conference call was over and I took a step back I saw the correct …

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question