#899. [Thu Summer Camp 2013]宇宙飞艇

[Thu Summer Camp 2013]宇宙飞艇

Description

image

Format

Inputimage

Output

image

Samples

4 
1 1 
0 1 
1 0 
-1 0 
0 -1
2 
2 
1 2 1 0

Limitation

image