View Compilation Error

0_0_36240338_31708.cpp: In function 'void bfs()':
0_0_36240338_31708.cpp:5:11: error: 'first' was not declared in this scope
 #define x first    
           ^
0_0_36240338_31708.cpp:65:20: note: in expansion of macro 'x'
                 st[x][y] =1, t.x=xx, t.y=yy, t.step=step+1, qq.push(t);
                    ^
0_0_36240338_31708.cpp:6:11: error: 'second' was not declared in this scope
 #define y second    
           ^
0_0_36240338_31708.cpp:65:23: note: in expansion of macro 'y'
                 st[x][y] =1, t.x=xx, t.y=yy, t.step=step+1, qq.push(t);
                       ^