/in/foo.cc: In member function 'void dts::segtree::set_st(dts::ll, dts::ll, dts::ll)':
/in/foo.cc:33:15: warning: value computed is not used [-Wunused-value]
    rec[ver].rt==-1,rec[ver].rtl=l,rec[ver].rtr=r;
                
/in/foo.cc: In function 'void dts::main()':
/in/foo.cc:161:19: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
      if ((++tag)+1>ltmst.rec.size())
          ~~~~~~~~~^~~~~~~~~~~~~~~~~