How to arrange array in decreasing order of frequency of each number?

Posted by Rajendra on Stack Overflow See other posts from Stack Overflow or by Rajendra
Published on 2010-03-25T16:07:50Z Indexed on 2010/03/25 16:13 UTC
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array

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interview-questions

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algorithm

Input : {5, 13, 6, 5, 13, 7, 8, 6, 5}

Output : {5, 5, 5, 13, 13, 6, 6, 7, 8}

Question is to arrange the numbers in the array in decreasing order of their frequency preserving the order of their occurrence.

If their is a tie, for example, here 13 and 6 then the number occurring first in input array would come first in output array.

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