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源点和汇点都要枚举吗？

Posted by Ghost2010 at 2011-03-13 10:31:22 on Problem 1966 
  我觉得如果转化为最大流去做，源点和汇点都要枚举，但是看到一些解题报告说只需要枚举汇点，测试一下，确实可以通过，可能是数据太弱把
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