240515 가희와 키워드

static int n;
static int m;
static Set<String> set = new HashSet<>();
static BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

public static void main(String[] args) throws Exception {
	StringTokenizer tokenizer = new StringTokenizer(br.readLine());

	n = Integer.parseInt(tokenizer.nextToken());
	m = Integer.parseInt(tokenizer.nextToken());

	for (int i = 0; i < n; i++) {
		set.add(br.readLine());
	}

	StringBuilder sb = new StringBuilder();

	for (int i = 0; i < m; i++) {
		StringTokenizer st = new StringTokenizer(br.readLine(), ",");
		while (st.hasMoreTokens()) {
			String s = st.nextToken();
			set.remove(s);
		}
		sb.append(set.size()).append("\n");
	}

	System.out.print(sb);
}

출처:https://www.acmicpc.net/problem/22233