#395. Checkpoints
Checkpoints




样例 #1
样例输入 #1
2 2
2 0
0 0
-1 0
1 0
样例输出 #1
2
1

样例 #2
样例输入 #2
3 4
10 10
-10 -10
3 3
1 2
2 3
3 5
3 5
样例输出 #2
3
1
2
样例 #3
样例输入 #3
5 5
-100000000 -100000000
-100000000 100000000
100000000 -100000000
100000000 100000000
0 0
0 0
100000000 100000000
100000000 -100000000
-100000000 100000000
-100000000 -100000000
样例输出 #3
5
4
3
2
1