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Problem 4943. -- [Noi2017]蚯蚓

4943: [Noi2017]蚯蚓

Time Limit: 50 Sec  Memory Limit: 512 MB
Submit: 358  Solved: 160
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Description

 http://www.lydsy.com/JudgeOnline/upload/Noi2017D1.pdf

Input

Output

Sample Input

Sample Output

HINT

Source

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