[C++] 프로그래머스 완주하지 못한 선수

#include <vector>
#include <algorithm>

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