HDU3468:A Simple Problem with Integers(线段树区间更新+lazy)
DescriptionYouhaveNintegers,A1,A2,...,AN.Youneedtodealwithtwokindsofoperations.Onetypeofoperationistoaddsomegivennumbertoeachnumberinagiveninterval.Theotheristoaskforthesumofnumbersinagiveninterval.In