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要是能构造出对偶图的话，这题很容易。

Posted by MetalHeart at 2009-06-09 15:36:02 on Problem 2638

Followed by:

我二分＋网络流验证，咋就不对呢？？？？？ (0) MetalHeart 2009-06-10 17:18:52
- 这边加了什么数据？我在原题那边过了，这里过不了. (0) MetalHeart 2009-06-11 19:07:29
  - 我情急下试了下标程，竟然也不过，加强版！！！ (0) MetalHeart 2009-06-11 19:13:28
    - 就是一个编译选择问题浪费我这么多时间，我要抗议。 (0) MetalHeart 2009-06-16 10:26:21
      - 抗议无效 ~~~ (0) nkzgm 2009-06-16 12:20:46

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