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 int TimTuaDeMin()
{
int min = int.MaxValue;
foreach (var item in ds)
{
if (item is Sach)
{
Sach s = (Sach)item;
if (min > s.TuaDe.Length)
{
min = s.TuaDe.Length;
}
}
else if (item is TapChi)
{
TapChi tc = (TapChi)item;
if (min > tc.TuDe.Length)
{
min = tc.TuDe.Length;
}
}
}
return(min);
}
public int TimTuaDeMax()
{
int max = int.MinValue;
foreach (var item in ds)
{
if (item is Sach)
{
Sach s = (Sach)item;
if (max < s.TuaDe.Length)
{
max = s.TuaDe.Length;
}
}
else if (item is TapChi)
{
TapChi tc = (TapChi)item;
if (max < tc.TuDe.Length)
{
max = tc.TuDe.Length;
}
}
}
return(max);
}
public int TimMaxBV()
{
int max = int.MinValue;
foreach (var item in ds)
{
if (item is TapChi)
{
TapChi t = (TapChi)item;
if (max < t.SoBaiViet)
{
max = t.SoBaiViet;
}
}
}
return(max);
}
public int TimMinBV()
{
int min = int.MaxValue;
foreach (var item in ds)
{
if (item is TapChi)
{
TapChi t = (TapChi)item;
if (min > t.SoBaiViet)
{
min = t.SoBaiViet;
}
}
}
return(min);
}
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);
}