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Problem 4913. -- [Sdoi2017] 遗忘的集合

4913: [Sdoi2017] 遗忘的集合

Time Limit: 50 Sec  Memory Limit: 512 MB
Submit: 140  Solved: 24
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Description

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

Input

Output

Sample Input

Sample Output

HINT

Source

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