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View Compilation Error

0_0_24106017_21356.cpp: In function 'int bfs(int, int, int, int, int, int)':
0_0_24106017_21356.cpp:28:19: error: 'class std::queue<std::pair<int, int> >' has no member named 'push_back'
                 Q.push_back(P(nx,ny));
                   ^


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