3456. Find Special Substring of Length K

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You are given a string s and an integer k. Determine if there exists a substring of length exactly k in s that satisfies the following conditions: - The substring consists of only one distinct character (e.g., "aaa" or "bbb"). - If there is a character immediately before the substring, it must be different from the character in the substring. - If there is a character immediately after the sub

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solution.cppC++17

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