Problem 3197. -- [Sdoi2013]assassin -- 衡阳八中OJ离线版-2014-11-04

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Problem 3197. -- [Sdoi2013]assassin -- 衡阳八中OJ离线版-2014-11-04

3197: [Sdoi2013]assassin

Time Limit: 10 Sec Memory Limit: 256 MB
Submit: 135 Solved: 62
[Submit][Status]

Description

Input

Output

Sample Input

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

Sample Output

1

HINT

Source

[Submit][Status]
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