classCodec {public: // Encodes a list of strings to a single string.stringencode(vector<string>& strs) { string encoded_string;for(auto& str: strs) { encoded_string +=to_string(str.length()) +"/"+ str; }return encoded_string; } // Decodes a single string to a list of strings.vector<string> decode(string s) { vector<string> res;int i =0;while(i <s.size()) {int slash =s.find("/", i);int length =stoi( s.substr(i, slash-i) );res.push_back( s.substr(slash+1, length) ); i = slash +1+ length; }return res; }};// Your Codec object will be instantiated and called as such:// Codec codec;// codec.decode(codec.encode(strs));