[실4] 14425 - 문자열 집합

int main()
{
	int n, m;
	cin >> n >> m;

	map<string, bool> d;

	for (int i = 0; i < n; i++)
	{
		string str;
		cin >> str;
		d[str] = true;
	}
	int cnt = 0;
	while (m--)
	{
		string str;
		cin >> str;

		cnt += d.contains(str);
	}
	cout << cnt;
}