LeetCode 3456: Find Special Substring of Length K Solution

Master LeetCode problem 3456 (Find Special Substring of Length K), a easy challenge, with our optimized solutions in Java, C++, and Python. Explore detailed explanations, test your code in our interactive editor, and prepare for coding interviews.

3456. Find Special Substring of Length K

Easy

String

Problem Explanation

Explanation

To solve this problem, we can iterate through the string s and check each substring of length k. For each substring, we check if it consists of only one distinct character, and if the character before and after the substring are different from the character in the substring. If these conditions are met for any substring, we return true. Otherwise, we return false.

Time complexity: O(n * k), where n is the length of string s.
Space complexity: O(1)

Solution Code

class Solution {
    public boolean hasSpecialSubstring(String s, int k) {
        for (int i = 0; i <= s.length() - k; i++) {
            if (isSpecialSubstring(s, i, k))
                return true;
        }
        return false;
    }
    
    private boolean isSpecialSubstring(String s, int start, int k) {
        char c = s.charAt(start);
        for (int i = start; i < start + k; i++) {
            if (s.charAt(i) != c)
                return false;
        }
        if (start > 0 && s.charAt(start - 1) == c)
            return false;
        if (start + k < s.length() && s.charAt(start + k) == c)
            return false;
        return true;
    }
}

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