The variance of a string is defined as the largest difference between the frequencies of any $2$ characters present in that string.

Given a string s consisting of lowercase English letters, return the maximum variance among all substrings of s.

A substring is a contiguous non empty sequence of characters within a string.

Constraints:

• $1 \leq$ s.length $\leq 10^4$

• s consists of lowercase English letters.

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Implement your solution in the following coding playground.