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这个题目严谨吗?下面的输入。。。。答案是impossible、 还是3, 或者4?

Posted by 274856653 at 2020-08-10 16:55:31 on Problem 1359
4
1 2 Y 3 N 
2 3 Y 4 N 
3 1 Y 2 Y 
4 1 Y 2 Y 

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