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Problem 5464. -- [Wc2017]挑战

5464: [Wc2017]挑战

Time Limit: 30 Sec  Memory Limit: 512 MB
Submit: 27  Solved: 2
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Description

www.lydsy.com/JudgeOnline/upload/wc2017.rar

Input

Output

Sample Input

Sample Output

HINT

Source

鸣谢Qingyu上传

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