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Problem B: [Lydsy1710月赛]小A的树

Problem B: [Lydsy1710月赛]小A的树

Time Limit: 10 Sec  Memory Limit: 256 MB
Submit: 1033  Solved: 304
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Description

www.lydsy.com/JudgeOnline/upload/201710/10.rar 

Input

Output

Sample Input

Sample Output

HINT

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