/in/foo.cc: In function 'int main()':
/in/foo.cc:21:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for (int i=0;i<ans.size();i++)
               ~^~~~~~~~~~~
/in/foo.cc: In function 'void dfs(int, int)':
/in/foo.cc:32:5: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses]
  if (dep==10)
     ^