You are given a string s that consists of lowercase English letters.
A string is called special if it is made up of only a single character. For example, the string "abc" is not special, whereas the strings "ddd", "zz", and "f" are special.
Return the length of the longest special substring of s which occurs at least thrice, or -1 if no special substring occurs at least thrice.
A substring is a contiguous non-empty sequence of characters within a string.
\n\n\n
Example 1:
\n\n\nInput: s = "aaaa"\nOutput: 2\nExplanation: The longest special substring which occurs thrice is "aa": substrings "aaaa", "aaaa", and "aaaa".\nIt can be shown that the maximum length achievable is 2.\n\n\n
Example 2:
\n\n\nInput: s = "abcdef"\nOutput: -1\nExplanation: There exists no special substring which occurs at least thrice. Hence return -1.\n\n\n
Example 3:
\n\n\nInput: s = "abcaba"\nOutput: 1\nExplanation: The longest special substring which occurs thrice is "a": substrings "abcaba", "abcaba", and "abcaba".\nIt can be shown that the maximum length achievable is 1.\n\n\n
\n
Constraints:
\n\n3 <= s.length <= 50s consists of only lowercase English letters.Compiled with clang 11 using the latest C++ 20 standard.
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