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有一组数据想不通

Posted by logics_space at 2009-01-13 14:04:15 on Problem 1474
5
0 -4
0 4
4 4
2 0
4 -4
6
0 -4
0 4
4 4
3 2
3 -2
4 -4
0

标程第一组是possible,第二组是impossible的
但我觉得这两组数据都应该是possible的
第二组数据我只是在第一组的基础上改了一点点,我觉得他们是等价的
谁能解释一个

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