231101 튜플

public int[] solution(String s) {
	String[] elements = extractElements(s);
	List<Integer> resultList = new ArrayList<>();

	Arrays.sort(elements, (s1, s2) -> s1.length() - s2.length());

	for (String element : elements) {
		String[] values = element.split(",");
		for (String value : values) {
			int intValue = Integer.parseInt(value);
			if (!resultList.contains(intValue)) {
				resultList.add(intValue);
			}
		}
	}

	return resultList.stream().mapToInt(Integer::intValue).toArray();
}

private String[] extractElements(String s) {
	return s.substring(2, s.length() - 2).split("},\\{");
}

출처:https://school.programmers.co.kr/learn/courses/30/lessons/64065