이가현

public String solution(String[] participant, String[] completion) { String answer = ""; //해쉬- 참가자 키, 값(1) 기본설정 HashMap<String, Integer> map = new HashMap<>(); for (String player : participant) map.put(player, map.getOrDefault(player, 0) + 1); //해쉬- 완주자일때 값 -1 for (String player : completion) map.put(player, map.get(player) - 1); //읽기 - 값이 0인 key 출력 Iterator<Map.Entry<String,Integer>> iterator = map.entrySet().iterator(); while (iterator.hasNext()) { Map.Entry<String, Integer> result = iterator.next(); if (result.getValue() != 0) { answer = result.getKey(); break; } } return answer; }