View Compilation Error

0_0_8063654_18135.cpp: In function `int costflow(int, int)':
0_0_8063654_18135.cpp:89: error: `g_aryPrev' undeclared (first use this function)
0_0_8063654_18135.cpp:89: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_8063654_18135.cpp: In function `int mincostmaxflow(int, int)':
0_0_8063654_18135.cpp:107: error: `spfalabel' undeclared (first use this function)