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Problem 4912. -- [Sdoi2017]天才黑客

4912: [Sdoi2017]天才黑客

Time Limit: 60 Sec  Memory Limit: 512 MB
Submit: 150  Solved: 67
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Description

 www.lydsy.com/JudgeOnline/upload/sdoi2017r2d2.pdf

Input

Output

Sample Input

Sample Output

HINT

Source

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