Question: Sort Characters by Frequency. Please use hash table, language doesn't matter. Given a string s , sort it in deceasing order based on the frequency

Sort Characters by Frequency. Please use hash table, language doesn't matter.

Given a string s , sort it in deceasing order based on the frequency of the characters. the frequency of a character is the number of times it appears in the string.

-- Example --

Input: s = "tree"

Output: "eert"

Explanation: e appears twice while r and t both appear once. So e must appear before both r and t.

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