View Compilation Error

0_0_11117856_20115.cpp: In function `int add_edge(int, int)':
0_0_11117856_20115.cpp:49: error: `count' undeclared (first use this function)
0_0_11117856_20115.cpp:49: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_11117856_20115.cpp: In function `int topo(int)':
0_0_11117856_20115.cpp:66: error: `count' undeclared (first use this function)
0_0_11117856_20115.cpp: In function `int main()':
0_0_11117856_20115.cpp:89: error: `count' undeclared (first use this function)