[프로그래머스] 완주하지 못한 선수

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import java.util.*;

class Solution {
    public String solution(String[] participant, String[] completion) {
        String answer = "";
        Arrays.sort(participant);
        Arrays.sort(completion);
        int i;
            for(i = 0 ; i < completion.length; i++){
                if(!participant[i].equals(completion[i])){
                    return participant[i];
                }
            }
        return participant[i];
    }
}