View Compilation Error

0_0_17015488_17735.cpp: In function 'int bfs()':
0_0_17015488_17735.cpp:121:9: error: 'x' was not declared in this scope
   if((m-x+n-y)>last)continue;
         ^
0_0_17015488_17735.cpp:121:13: error: 'y' was not declared in this scope
   if((m-x+n-y)>last)continue;
             ^
0_0_17015488_17735.cpp:121:16: error: 'last' was not declared in this scope
   if((m-x+n-y)>last)continue;
                ^