완주하지 못한 선수

import java.util.*; class Solution { public String solution(String[] participant, String[] completion) { String answer = ""; Arrays.sort(participant); Arrays.sort(completion); int length = participant.length-1; int start = 0; int end = completion.length-1; if(participant.length != 1) { for(int i = 0; i < participant.length/2+1; i++) { if(!completion[start].equals(participant[i])) { answer = participant[i]; break; } else if(!completion[end-start].equals(participant[length-i])) { answer = participant[length-i]; break; } start++; } } else { answer = participant[0]; } return answer; } }