Sorting the elements by frequency – Let us code

Sorting the elements by frequency – Let us code

Given an array, how do we sort the elements by descending order of their frequency?

Also if two elements appear for same number of times, one which appeared first in the input array should be placed first.

For example, if A = [7, 6, 1, 7, 1, 3, 6, 6, 2]

The output should be [6, 6, 6, 7, 7, 1, 1, 3, 2]

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