/in/foo.cc: In function 'int search(Node)':
/in/foo.cc:135:1: warning: control reaches end of non-void function [-Wreturn-type]
  135 | }
      | ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:141:18: warning: iteration 9 invokes undefined behavior [-Waggressive-loop-optimizations]
  141 |         hashs[i] = hashs[i-1] * i;
      |         ~~~~~~~~~^~~~~~~~~~~~~~~~
/in/foo.cc:140:18: note: within this loop
  140 |     for(int i=1;i<11;i++){
      |                 ~^~~