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Re:请求加强数据

Posted by miaojiexiaa at 2019-05-25 16:25:53 on Problem 1228
In Reply To:请求加强数据 Posted by:miaojiexiaa at 2019-05-25 16:25:16
Input:
1
7
0 0
1 0
2 0
2 1
2 2
1 2
0 2

Output:
NO

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