View Compilation Error

0_0_10544307_7444.cpp: In function `int Directed_MST(int)':
0_0_10544307_7444.cpp:36: error: `nv' undeclared (first use this function)
0_0_10544307_7444.cpp:36: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_10544307_7444.cpp:46: error: `in' undeclared (first use this function)
0_0_10544307_7444.cpp:77: error: `Id' undeclared (first use this function)
0_0_10544307_7444.cpp: In function `int main(int, char**)':
0_0_10544307_7444.cpp:129: error: `ZhuLiu' undeclared (first use this function)