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Problem 4910. -- [Sdoi2017] 苹果树

4910: [Sdoi2017] 苹果树

Time Limit: 50 Sec  Memory Limit: 512 MB
Submit: 208  Solved: 66
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Description

 www.lydsy.com/JudgeOnline/upload/sdoi2017r2d1.pdf

Input

Output

Sample Input

Sample Output

HINT

Source

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