View Compilation Error

0_0_37722712_1735.cpp: In function 'bool bfs()':
0_0_37722712_1735.cpp:47:7: error: converting to 'std::queue<std::pair<int, int> >' from initializer list would use explicit constructor 'std::queue<_Tp, _Sequence>::queue(_Sequence&&) [with _Tp = std::pair<int, int>; _Sequence = std::deque<std::pair<int, int>, std::allocator<std::pair<int, int> > >]'
     p = {};
       ^