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帮忙看看这组数据

Posted by kk9263 at 2012-02-13 15:04:54 on Problem 1716
4
1 5
2 4
3 6
4 7


1 2 3 4 5 6 7 
- - - - -
  - - -
    - - - -
      - - - -

答案是3 还是 2 ?
AC 代码给出的是 2  ...可是我真是不知道取哪两个,是我题目理解错了?

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