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Problem 5129. -- [Lydsy1712月赛]树上传送

5129: [Lydsy1712月赛]树上传送

Time Limit: 30 Sec  Memory Limit: 256 MB
Submit: 214  Solved: 45
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Description

 http://www.lydsy.com/JudgeOnline/upload/201712/prob12.pdf

Input

Output

Sample Input

Sample Output

HINT

Source

claris原创,本oj版权所有,翻版必究

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