View Compilation Error

0_0_17818007_16593.cpp: In function 'int BFS(int)':
0_0_17818007_16593.cpp:55:12: error: 'tx' was not declared in this scope
            tx=tx+dir[i][0],ty=ty+dir[i][1];
            ^
0_0_17818007_16593.cpp:55:28: error: 'ty' was not declared in this scope
            tx=tx+dir[i][0],ty=ty+dir[i][1];
                            ^
0_0_17818007_16593.cpp:58:23: error: 'fx' was not declared in this scope
                    if(fx==n-1) return 1;
                       ^