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 <= 105s contains only the characters 'a', 'b', and 'c'.