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451. Sort Characters By Frequency

https://leetcode.com/problems/sort-characters-by-frequency/

Python

from collections import Counter


class Solution:
    def frequencySort(self, s: str) -> str:
        counts = [(char, count) for char, count in Counter(s).items()]
        counts.sort(key=lambda item: item[1], reverse=True)

        return ''.join([char*count for char, count in counts])

Python