/in/foo.cc: In function 'void dts::main()':
/in/foo.cc:152:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (int i=0;i<x.size();i++)
                ~^~~~~~~~~
/in/foo.cc:157:9: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if (i<x.size())
        ~^~~~~~~~~
/in/foo.cc: In function 'int dts::search(int)':
/in/foo.cc:131:2: warning: control reaches end of non-void function [-Wreturn-type]
  }
  ^