Problem2011--noip2018 对称二叉树

2011: noip2018 对称二叉树

Time Limit: 1 Sec  Memory Limit: 128 MB
Submit: 1  Solved: 1
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Description

Input

Sample Input Copy 

10 
2 2 5 5 5 5 4 4 2 3 
9 10 
-1 -1 
-1 -1 
-1 -1 
-1 -1 
-1 2 
3 4 
5 6 
-1 -1 
7 8

Sample Output Copy 

3

HINT

Source/Category

noip noip2018 noip普及组 
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