제출 #140280

2 1
1 2
4 3
2 4
3 2
3 4
0 0

Case 1: There is one tree.
Case 2: A forest of 2 trees.

Case 1: There is one tree.
Case 2: There is one tree.

3 0
7 6
1 2
3 7
4 7
5 7
6 7
5 4
0 0

Case 1: A forest of 3 trees.
Case 2: A forest of 2 trees.

Case 1: A forest of 3 trees.
Case 2: There is one tree.

3 3
1 2
3 2
3 1
4 3
4 2
2 3
4 3
0 0

Case 1: There is one tree.
Case 2: A forest of 2 trees.

Case 1: No trees.
Case 2: There is one tree.