/in/foo.cc: In function 'int main()':
/in/foo.cc:69:16: error: 'l' was not declared in this scope
             if(l>0)
                ^
/in/foo.cc:68:11: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
         if(!(bj<=bi))
           ^
/in/foo.cc: In function 'bool check(char)':
/in/foo.cc:45:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^