#include <string>
#include <vector>
#include <algorithm>
using namespace std;
string solution(vector<string> participant, vector<string> completion) {
string answer = "";
sort(participant.begin(), participant.end());
sort(completion.begin(), completion.end());
int i;
for(i=0; i<completion.size(); i++){
if(participant[i] != completion[i]) break;
}
answer = participant[i];
return answer;
}
매우쉬움