제출 #139240

5 4
4 3
5 3
1 2
4 5
0 0

Case 1: No trees.

Case 1: There is one tree.

5 0
4 3
4 2
2 3
3 4
0 0

Case 1: A forest of 5 trees.
Case 2: No trees.

Case 1: A forest of 5 trees.
Case 2: There is one tree.

8 6
2 1
5 8
6 7
3 4
7 5
8 7
0 0

Case 1: There is one tree.

Case 1: A forest of 2 trees.