View Compilation Error

0_0_33709238_28051.cpp: In function 'void bfs()':
0_0_33709238_28051.cpp:32:13: error: 'xx' was not declared in this scope
    if(check(xx,yy))
             ^
0_0_33709238_28051.cpp:32:16: error: 'yy' was not declared in this scope
    if(check(xx,yy))
                ^