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pdf版的题目下载：初赛goo.gl/rfbDY，决赛goo.gl/fNcyY。K题请使用GUN C++提交，用VC/VC++提交会返回RE。

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2_14855_1391525_9078.cpp
2_14855_1391525_9078.cpp(3) : fatal error C1083: 无法打开包含文件:“castdio”: No such file or directory