LeetCode 271: Encode and Decode Strings Solution

Master LeetCode problem 271 (Encode and Decode Strings), a medium 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.

271. Encode and Decode Strings

Medium

Array String Design

Problem Explanation

Explanation:

To encode and decode a list of strings, we can use a delimiter to separate each string when encoding. During encoding, we concatenate all the strings with a delimiter in between. During decoding, we split the encoded string using the delimiter to retrieve the original list of strings.

Encoding:

Concatenate all strings in the input list with a delimiter in between.
Return the concatenated string.

Decoding:

Split the encoded string using the delimiter.
Return the list of strings.

Time Complexity:

Encoding: O(n), where n is the total number of characters in all strings.
Decoding: O(n), where n is the length of the encoded string.

Space Complexity:

Encoding: O(n), where n is the total number of characters in all strings.
Decoding: O(n), where n is the length of the encoded string.

Solution Code

public class Codec {

    // Encodes a list of strings to a single string.
    public String encode(List<String> strs) {
        return String.join("#", strs);
    }

    // Decodes a single string to a list of strings.
    public List<String> decode(String s) {
        return Arrays.asList(s.split("#"));
    }
}

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