Maximum Length Substring With Two Occurrences

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Given a string s, return the maximum length of a substring such that it contains at most two occurrences of each character.

 

Example 1:

Input: s = "bcbbbcba"

Output: 4

Explanation:

The following substring has a length of 4 and contains at most two occurrences of each character: "bcbbbcba".

Example 2:

Input: s = "aaaa"

Output: 2

Explanation:

The following substring has a length of 2 and contains at most two occurrences of each character: "aaaa".

 

Constraints:

• 2 <= s.length <= 100
• s consists only of lowercase English letters.