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注意一条线路上可能出现两个o，我就是坑在这里造成wa

Posted by supergissss at 2018-09-08 13:24:27 on Problem 1048 
A---+
    |    
    +---:\
        : >o--o:\
    +---:/     : )---?
    |      C--o:/
    +---+
        |
B-------+
*
00000000000000000000000000
*
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