3090. Maximum Length Substring With Two Occurrences

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" (the substring "bcba").

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: "aa".

Constraints

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