/in/foo.cc: In function 'void Find(int)':
/in/foo.cc:45:16: warning: unused variable 'ff' [-Wunused-variable]
     int u=root,ff=0;
                ^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:89:13: warning: 'treemode' may be used uninitialized in this function [-Wmaybe-uninitialized]
             if (treemode==mode) insert(v);
             ^~