public DanhSachAnPham TimTuaDeDaiNhat(DanhSachAnPham a)
{
DanhSachAnPham kq = new DanhSachAnPham();
int max = a.TimTuaDeMax();
foreach (var item in a.ds)
{
if (item is Sach)
{
Sach s = (Sach)item;
if (s.TuaDe.Length == max)
{
kq.Them(item);
}
}
else if (item is TapChi)
{
TapChi tc = (TapChi)item;
if (tc.TuDe.Length == max)
{
kq.Them(item);
}
}
}
return(kq);
}
public DanhSachAnPham TimDSBao(DanhSachAnPham a)
{
DanhSachAnPham kq = new DanhSachAnPham();
foreach (var item in a.ds)
{
if (item is Bao)
{
kq.Them(item);
}
}
return(kq);
}
public DanhSachAnPham TimSoTrangMin(DanhSachAnPham a)
{
DanhSachAnPham kq = new DanhSachAnPham();
int min = a.TimTrangMin();
foreach (var item in a.ds)
{
if (item.SoTrang == min)
{
kq.Them(item);
}
}
return(kq);
}
public DanhSachAnPham TimTCBVMin(DanhSachAnPham a)
{
DanhSachAnPham ds = TimDSTapChi(a);
DanhSachAnPham kq = new DanhSachAnPham();
int min = ds.TimMinBV();
for (int i = 0; i < ds.Dai(); i++)
{
if (ds[i] is TapChi)
{
TapChi tc = (TapChi)ds[i];
if (tc.SoBaiViet == min)
{
kq.Them(ds[i]);
}
}
}
return(kq);
}