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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。

View Compilation Error

D:\HDOJ\temp\2_14855_1080464_20561.cpp: In function `bool spfa()':
D:\HDOJ\temp\2_14855_1080464_20561.cpp:33: error: integer constant is too large for "long" type