/*

Time Complexity: O(n)

Space Complexity: O(1)

non-ASCII 유니코드 문자를 사용함

To-Do : escaping 방법 학습하기

*/

public class Codec {

// Encodes a list of strings to a single string.

public String encode(List<String> strs) {

StringBuilder sb = new StringBuilder();

for (int i = 0; i < strs.size(); i++) {

if (i > 0) {

sb.append('\u2764');

}

sb.append(strs.get(i));

}

return sb.toString();

}

// Decodes a single string to a list of strings.

public List<String> decode(String s) {

return new ArrayList<>(Arrays.asList(s.split("\u2764")));

}

}

// Your Codec object will be instantiated and called as such:

// Codec codec = new Codec();

// codec.decode(codec.encode(strs));