제출 #145297

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

Case 1: A forest of 3 trees.
Case 2: A forest of 2 trees.
Case 3: A forest of 3 trees.
Case 4: No trees.

Case 1: A forest of 3 trees.
Case 2: A forest of 2 trees.
Case 3: A forest of 3 trees.
Case 4: There is one tree.

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

Case 1: No trees.
Case 2: A forest of 4 trees.

Case 1: There is one tree.
Case 2: A forest of 4 trees.

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

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

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