S = "aaabcdbbdcccf"
lst = sorted(S, key=lambda x: S.count(x), reverse=True)
lst
输出:['c', 'c', 'c', 'c', 'a', 'a', 'a', 'b', 'b', 'b', 'd', 'd', 'f']

767.重构字符串

767.重构字符串

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