/in/foo.cc: In function 'void search_DFS(std::__cxx11::string)':
/in/foo.cc:32:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(ans&&j+xtzm==x.size())
             ~~~~~~^~~~~~~~~~
/in/foo.cc:34:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(ans&&j+xtzm!=x.size())
             ~~~~~~^~~~~~~~~~
/in/foo.cc:49:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  if(!ans&&sum.size()>maxn)
           ~~~~~~~~~~^~~~~