I use about 3*n operations but TL81 or TL84!!!

I got TL because I used map(int, input().split())

Edited by author 22.08.2018 00:07

5
0 0
2 2
3 1
4 0
6 2

Answer:
5

I have got AC, but I have found test for which my AC program gives wrong answer. I sent it to timus_support@acm.timus.ru.

Please don't make so stupid mistakes that I did. Lost about 3 hours on the contest, gratz to me.

Anti-WA #51:
4
0 0
2 0
1 1
1 2
Answer: oo

Anti-WA #52:
4
0 0
1 2
2 2
3 0
Answer: oo