@@ -0,0 +1,646 @@
+// http://codeforces.com/problemset/problem/615/A%0A%0Aimport java.util.HashSet;%0Aimport java.util.Scanner;%0Aimport java.util.Set;%0A%0Apublic class Solution %7B%0A%0A%09public static void main(String%5B%5D args) %7B%0A%09%09Scanner read = new Scanner(System.in);%0A%09%09%0A%09%09int n = read.nextInt();%0A%09%09int m = read.nextInt();%0A%09%09%0A%09%09Set%3CInteger%3E turnedOnBulbs = new HashSet%3CInteger%3E();%0A%09%09for (int i = 0; i %3C n; ++i) %7B%0A%09%09%09int x = read.nextInt();%0A%09%09%09for (int y = 0; y %3C x; ++y) %7B%0A%09%09%09%09turnedOnBulbs.add(read.nextInt());%0A%09%09%09%7D%0A%09%09%7D%0A%09%09%0A%09%09if (turnedOnBulbs.size() == m) %7B%0A%09%09%09System.out.println(%22YES%22);%0A%09%09%7D%0A%09%09else %7B%0A%09%09%09System.out.println(%22NO%22);%0A%09%09%7D%0A%09%09%0A%09%09// Close scanner%0A%09%09read.close();%0A%09%7D%0A%09%0A%7D%0A

Create Bulbs.java