algorithm to find the three majority elements in an array

Posted by Qiang Li on Stack Overflow See other posts from Stack Overflow or by Qiang Li
Published on 2011-11-21T01:04:47Z Indexed on 2011/11/21 1:50 UTC
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algorithm

Let's say there are three elements in a non-sorted array all of which appear more than one-fourth times of the total number of elements.

What is the most efficient way to find these elements? Both for non-online and online versions of this question.

Thank you!

Edit

The non-online version I was referring to is: this array is specified in full. The online version means the array elements are coming one at a time.

I require the space in addition to time complexity to be tight.

disclaimer: THIS IS NOT HOMEWORK! I consider this as research-level question.

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