LeetCode 1147: Longest Chunked Palindrome Decomposition Solution

Master LeetCode problem 1147 (Longest Chunked Palindrome Decomposition), a hard 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.

1147. Longest Chunked Palindrome Decomposition

Hard

Two Pointers String Dynamic Programming Greedy Rolling Hash Hash Function

Problem Explanation

Explanation:

To solve this problem, we can use a greedy approach. We iterate from both ends of the input string and try to find matching chunks. When we find a matching chunk, we recursively process the remaining middle part of the string. This way, we can find the maximum number of chunks that satisfy the given conditions.

Algorithm:
1. Start with two pointers left at the beginning of the string and right at the end of the string.
2. Check if there is a matching chunk starting from left and right positions. If found, increment the count of chunks and recursively process the remaining middle part of the string.
3. Repeat the above step until the entire string is processed.
4. Return the count of chunks found.
Time Complexity: O(N^2) where N is the length of the input string.
Space Complexity: O(N) for the recursive calls stack.

: :

Solution Code

class Solution {
    public int longestDecomposition(String text) {
        return helper(text, 0, text.length() - 1);
    }
    
    private int helper(String text, int left, int right) {
        if (left > right) return 0;
        
        for (int len = 1; len <= (right - left + 1) / 2; len++) {
            if (text.substring(left, left + len).equals(text.substring(right - len + 1, right + 1))) {
                return 2 + helper(text, left + len, right - len);
            }
        }
        
        return 1;
    }
}

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