View Compilation Error

0_0_2976626_27719.cpp: In function `bool bfs(std::queue<Q, std::deque<Q, std::allocator<Q> > >&)':
0_0_2976626_27719.cpp:43: error: `x' undeclared (first use this function)
0_0_2976626_27719.cpp:43: error: (Each undeclared identifier is reported only once for each function it appears in.)
0_0_2976626_27719.cpp: In function `int main()':
0_0_2976626_27719.cpp:80: error: no matching function for call to `Q::Q(int&, int, int)'
0_0_2976626_27719.cpp:16: note: candidates are: Q::Q(const Q&)
0_0_2976626_27719.cpp:23: note:                 Q::Q(int, char, int, int)
0_0_2976626_27719.cpp:21: note:                 Q::Q()
0_0_2976626_27719.cpp:82: error: no matching function for call to `Q::Q(int&, int, int&)'
0_0_2976626_27719.cpp:16: note: candidates are: Q::Q(const Q&)
0_0_2976626_27719.cpp:23: note:                 Q::Q(int, char, int, int)
0_0_2976626_27719.cpp:21: note:                 Q::Q()