how can one do frequency sort .
Suppose we have an integer array like
1,2,3,1,2,3,1,1,2,3,4,4,3,5,3
Then 1 is appearing 4 times
2 - 3
3- 5
4-2
5-1
Then if we sort by frequency we shud have this as result
5,4,4,2,2,2,1,1,1,1,3,3,3,3,3
How to do it
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