[프로그래머스] 완주하지 못한 선수

import java.util.HashMap;
import java.util.Map;

class Solution{
    public String solution(String[] participant, String[] completion) {
        String answer = "";
        Map<String, Integer> hmParticipant = new HashMap<String, Integer>();

        for (String p : participant) {
            hmParticipant.put(p, (int)hmParticipant.getOrDefault(p, 0) + 1);
        }

        for (String c : completion) {
            hmParticipant.put(c, (int)hmParticipant.getOrDefault(c, 0) - 1);
        }

        for(Map.Entry<String, Integer> entry : hmParticipant.entrySet()) {
            if (entry.getValue() > 0) {
                answer = entry.getKey();
                break;
            }
        }

        return answer;
    }
}