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第二组数据
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Topic
] 2009-09-06 15:32:18
team223
1应该能3交流，同时3包含了2，应该也能交流，那么答案应该是3，为什么是2呢？那个不认为能交流呢？
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University of Science and Technology of China
Online Judge for ACM/ICPC
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