LeetCode 1566: Detect Pattern of Length M Repeated K or More Times Solution

Master LeetCode problem 1566 (Detect Pattern of Length M Repeated K or More Times), 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.

1566. Detect Pattern of Length M Repeated K or More Times

Easy

Array Enumeration

Problem Explanation

Explanation

To solve this problem, we can iterate through all possible patterns of length m in the arr. For each pattern, we check if it is repeated k or more times consecutively in the array. If we find such a pattern, we return true. Otherwise, we return false.

We need to iterate through all possible patterns of length m, which will take O(n) time.
For each pattern, we need to check if it is repeated k or more times, which will also take O(n) time.
Therefore, the overall time complexity of this solution is O(n^2).

The space complexity of this solution is O(1) as we are not using any extra space other than a few variables.

Solution Code

class Solution {
    public boolean containsPattern(int[] arr, int m, int k) {
        int n = arr.length;
        
        for (int i = 0; i + m * k <= n; i++) {
            boolean foundPattern = true;
            for (int j = 0; j < m; j++) {
                for (int rep = 1; rep < k; rep++) {
                    if (arr[i + j] != arr[i + j + rep * m]) {
                        foundPattern = false;
                        break;
                    }
                }
                if (!foundPattern) {
                    break;
                }
            }
            if (foundPattern) {
                return true;
            }
        }
        
        return false;
    }
}

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