/in/foo.cc: In function 'void dts::tr_dfs1(dts::ll, dts::ll)':
/in/foo.cc:29:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for (ll i=0;i<tr[now].s.size();i++)
               ~^~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'void dts::tr_dfs2(dts::ll, dts::ll)':
/in/foo.cc:48:17: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    for (ll i=0;i<tr[now].s.size();i++)
                ~^~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'dts::ll dts::ask(dts::ll, dts::ll)':
/in/foo.cc:149:16: warning: array subscript is below array bounds [-Warray-bounds]
    ians+=st_ask(&nst[-1],1,tr[tr[i].top].id,tr[i].id);
          ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:151:16: warning: array subscript is below array bounds [-Warray-bounds]
    jans+=st_ask(&nst[-1],1,tr[tr[j].top].id,tr[j].id);
          ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:152:27: warning: array subscript is below array bounds [-Warray-bounds]
   ll ansn=ians+jans+st_ask(&nst[-1],1,tr[lcan].id,tr[i].id)+st_ask(&nst[-1],1,tr[lcan].id,tr[j].id)-st_ask(&nst[-1],1,tr[lcan].id,tr[lcan].id);
                     ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:152:67: warning: array subscript is below array bounds [-Warray-bounds]
   ll ansn=ians+jans+st_ask(&nst[-1],1,tr[lcan].id,tr[i].id)+st_ask(&nst[-1],1,tr[lcan].id,tr[j].id)-st_ask(&nst[-1],1,tr[lcan].id,tr[lcan].id);
                                                             ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:152:107: warning: array subscript is below array bounds [-Warray-bounds]
   ll ansn=ians+jans+st_ask(&nst[-1],1,tr[lcan].id,tr[i].id)+st_ask(&nst[-1],1,tr[lcan].id,tr[j].id)-st_ask(&nst[-1],1,tr[lcan].id,tr[lcan].id);
                                                                                                     ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:153:17: warning: array subscript is below array bounds [-Warray-bounds]
   ll ansl=st_ask(&lst[-1],1,tr[lcan].dep,tr[x].dep)+st_ask(&lst[-1],1,tr[lcan].dep,tr[y].dep)-st_ask(&lst[-1],1,tr[lcan].dep,tr[lcan].dep);
           ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:153:59: warning: array subscript is below array bounds [-Warray-bounds]
   ll ansl=st_ask(&lst[-1],1,tr[lcan].dep,tr[x].dep)+st_ask(&lst[-1],1,tr[lcan].dep,tr[y].dep)-st_ask(&lst[-1],1,tr[lcan].dep,tr[lcan].dep);
                                                     ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:153:101: warning: array subscript is below array bounds [-Warray-bounds]
   ll ansl=st_ask(&lst[-1],1,tr[lcan].dep,tr[x].dep)+st_ask(&lst[-1],1,tr[lcan].dep,tr[y].dep)-st_ask(&lst[-1],1,tr[lcan].dep,tr[lcan].dep);
                                                                                               ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'void dts::main()':
/in/foo.cc:181:11: warning: array subscript is below array bounds [-Warray-bounds]
   st_build(&nst[-1],1,1,cnt,&d[0]);
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:183:11: warning: array subscript is below array bounds [-Warray-bounds]
   st_build(&lst[-1],1,1,maxdep,&d[0]);
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc:194:15: warning: array subscript is below array bounds [-Warray-bounds]
      st_update(&lst[-1],1,x,x,y);
      ~~~~~~~~~^~~~~~~~~~~~~~~~~~
/in/foo.cc:196:15: warning: array subscript is below array bounds [-Warray-bounds]
      st_update(&lst[-1],1,x,x,-y);
      ~~~~~~~~~^~~~~~~~~~~~~~~~~~~