View Compilation Error

0_0_25452586_12853.cpp: In function 'int main()':
0_0_25452586_12853.cpp:2:11: error: 'class std::queue<std::pair<int, int> >' has no member named 'first'
 #define x first
           ^
0_0_25452586_12853.cpp:138:39: note: in expansion of macro 'x'
         while (!hist.empty() ) q[hist.x][hist.y].resize (0), hist.pop();
                                       ^
0_0_25452586_12853.cpp:3:11: error: 'class std::queue<std::pair<int, int> >' has no member named 'second'
 #define y second
           ^
0_0_25452586_12853.cpp:138:47: note: in expansion of macro 'y'
         while (!hist.empty() ) q[hist.x][hist.y].resize (0), hist.pop();
                                               ^