1781. Sum of Beauty of All Substrings

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The beauty of a string is the difference in frequencies between the most frequent and least frequent characters. - For example, the beauty of "abaacc" is 3 - 1 = 2. Given a string s, return the sum of beauty of all of its substrings. Example 1: Input: s = "aabcb" Output: 5 Explanation: The substrings with non-zero beauty are ["aab","aabc","aabcb","abcb","bcb"], each with beauty equal to 1.

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