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Problem 5290. -- [Hnoi2018]道路

5290: [Hnoi2018]道路

Time Limit: 20 Sec  Memory Limit: 512 MB
Submit: 254  Solved: 152
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Description

 www.lydsy.com/JudgeOnline/upload/201804/%E6%B9%96%E5%8D%97%E4%BA%8C%E8%AF%95%E8%AF%95%E9%A2%98.pdf

Input

Output

Sample Input

Sample Output

HINT

Source

鸣谢hu1029282594上传

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