View Compilation Error

0_0_36620933_17362.cpp: In function 'void BFS(int, int)':
0_0_36620933_17362.cpp:13:2: error: 'queue' was not declared in this scope
  queue<Node>q;
  ^
0_0_36620933_17362.cpp:13:12: error: expected primary-expression before '>' token
  queue<Node>q;
            ^
0_0_36620933_17362.cpp:13:13: error: 'q' was not declared in this scope
  queue<Node>q;
             ^
0_0_36620933_17362.cpp:26:36: error: 'M' was not declared in this scope
    if(n.x < H && n.x >= 0 && n.y < M && n.y >= 0)if(m[n.x][n.y] == '.')
                                    ^