View Compilation Error

0_0_21309224_20550.cpp: In function 'void dfs(int, int, int)':
0_0_21309224_20550.cpp:10:8: error: 'xx' was not declared in this scope
     if(xx<0 || xx>=n || yy<0 || yy>=m)
        ^
0_0_21309224_20550.cpp:10:25: error: 'yy' was not declared in this scope
     if(xx<0 || xx>=n || yy<0 || yy>=m)
                         ^