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View Compilation Error

0_0_8793568_19490.cpp: In member function `void Edge::add(int, int)':
0_0_8793568_19490.cpp:27: error: `u' undeclared (first use this function)
0_0_8793568_19490.cpp:27: error: (Each undeclared identifier is reported only once for each function it appears in.)


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