longest-balanced-substring-ii

You are given a string s consisting only of the characters 'a', 'b', and 'c'.

A substring of s is called balanced if all distinct characters in the substring appear the same number of times.

Return the length of the longest balanced substring of s.

Example 1:

Input: s = "abbac"

Output: 4

Explanation:

The longest balanced substring is "abba" because both distinct characters 'a' and 'b' each appear exactly 2 times.

Example 2:

Input: s = "aabcc"

Output: 3

Explanation:

The longest balanced substring is "abc" because all distinct characters 'a', 'b' and 'c' each appear exactly 1 time.

Example 3:

Input: s = "aba"

Output: 2

Explanation:

One of the longest balanced substrings is "ab" because both distinct characters 'a' and 'b' each appear exactly 1 time. Another longest balanced substring is "ba".

Constraints:

• 1 <= s.length <= 105


• s contains only the characters 'a', 'b', and 'c'.