https://programmers.co.kr/learn/courses/30/lessons/42576
import java.util.*;
class Solution {
public String solution(String[] participant, String[] completion) {
Arrays.sort(participant);
Arrays.sort(completion);
for(int i=0; i<completion.length; i++)
{
if(!participant[i].equals(completion[i]))
{
return participant[i];
}
}
return participant[participant.length-1];
}
}
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