View Compilation Error

0_0_2936627_7172.cpp: In function `void tarjan(int, std::stack<int, std::deque<int, std::allocator<int> > >)':
0_0_2936627_7172.cpp:30: error: `count' undeclared (first use this function)
0_0_2936627_7172.cpp:30: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2936627_7172.cpp: In function `int main()':
0_0_2936627_7172.cpp:60: error: `count' undeclared (first use this function)