개발뚱땅

#include <string>
#include <vector>

using namespace std;

string solution(string s) {
    string answer = "";
    //짝수인경우
    int ssize = s.size();
    if(ssize%2 == 0){
        answer.push_back(s[(ssize>>1)-1]);
        answer.push_back(s[(ssize>>1)]);
    }else{
        answer.push_back(s[(ssize>>1)]);
    }
    return answer;
}