foo.cpp: In function 'int main()':
foo.cpp:200:24: error: 'scanf' was not declared in this scope
     int n;scanf("%d",&n);
                        ^
foo.cpp:211:22: error: 'printf' was not declared in this scope
     printf("%d\n",ret);
                      ^
foo.cpp: In member function 'bool SuffixTree::_actsgotonextsuf()':
foo.cpp:165:5: warning: control reaches end of non-void function [-Wreturn-type]
     }
     ^