/in/foo.cc: In function 'void Maintain(int)':
/in/foo.cc:16:8: warning: operation on 'T[v].SegT::t' may be undefined [-Wsequence-point]
  T[v].t=T[v].mx=T[v].se=T[v].t=T[v].sum=0;
  ~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/in/foo.cc: In function 'void Build(int, int, int)':
/in/foo.cc:61:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=L+R>>1;
          ~^~