public abstract class DiemHP {
    private String tenHP;
    private int soTinChi;

    public DiemHP(String tenHP, int soTinChi) {
        this.tenHP = tenHP;
        setSoTinChi(soTinChi);
    }

    public abstract double tinhDiem();      // KHONG co than

public class HPLyThuyet extends DiemHP {
    private double chuyenCan, giuaKy, cuoiKy;

    public HPLyThuyet(String tenHP, int tc,
                      double cc, double gk, double ck) {
        super(tenHP, tc);                   // dong dau tien
        this.chuyenCan = cc; this.giuaKy = gk; this.cuoiKy = ck;
    }

    @Override
    public double tinhDiem() {
        return chuyenCan * 0.1 + giuaKy * 0.2 + cuoiKy * 0.7;
    }
}

@Override
public double tinhDiem() {
    return (db1 + db2 + db3) / 3;
}

@Override
public String toString() {
    double d = Math.round(tinhDiem() * 100) / 100.0;   // goi da hinh
    return tenHP + " (" + soTinChi + " TC): " + d;
}

// ===== DiemHP.java =====
public abstract class DiemHP {
    private String tenHP;
    private int soTinChi;

    public DiemHP(String tenHP, int soTinChi) {
        this.tenHP = tenHP;
        setSoTinChi(soTinChi);
    }

    public String getTenHP() { return tenHP; }

    public int getSoTinChi() { return soTinChi; }

    public void setSoTinChi(int tc) {
        if (tc >= 1 && tc <= 4) this.soTinChi = tc;
    }

    public abstract double tinhDiem();

    @Override
    public String toString() {
        double d = Math.round(tinhDiem() * 100) / 100.0;
        return tenHP + " (" + soTinChi + " TC): " + d;
    }
}

// ===== HPLyThuyet.java =====
public class HPLyThuyet extends DiemHP {
    private double chuyenCan, giuaKy, cuoiKy;

    public HPLyThuyet(String tenHP, int soTinChi,
                      double chuyenCan, double giuaKy, double cuoiKy) {
        super(tenHP, soTinChi);
        setChuyenCan(chuyenCan);
        setGiuaKy(giuaKy);
        setCuoiKy(cuoiKy);
    }

    public void setChuyenCan(double d) { if (d >= 0 && d <= 10) chuyenCan = d; }
    public void setGiuaKy(double d)    { if (d >= 0 && d <= 10) giuaKy = d; }
    public void setCuoiKy(double d)    { if (d >= 0 && d <= 10) cuoiKy = d; }

    @Override
    public double tinhDiem() {
        return chuyenCan * 0.1 + giuaKy * 0.2 + cuoiKy * 0.7;
    }
}

// ===== HPThucHanh.java =====
public class HPThucHanh extends DiemHP {
    private double db1, db2, db3;

    public HPThucHanh(String tenHP, int soTinChi,
                      double db1, double db2, double db3) {
        super(tenHP, soTinChi);
        setDb1(db1); setDb2(db2); setDb3(db3);
    }

    public void setDb1(double d) { if (d >= 0 && d <= 10) db1 = d; }
    public void setDb2(double d) { if (d >= 0 && d <= 10) db2 = d; }
    public void setDb3(double d) { if (d >= 0 && d <= 10) db3 = d; }

    @Override
    public double tinhDiem() {
        return (db1 + db2 + db3) / 3;
    }
}

public double tinhDTB() {
    int tc1 = hp1.getSoTinChi();
    int tc2 = hp2.getSoTinChi();
    if (tc1 + tc2 == 0) return 0;
    return (hp1.tinhDiem() * tc1 + hp2.tinhDiem() * tc2) / (tc1 + tc2);
}

@Override
public String toString() {
    double dtb = Math.round(tinhDTB() * 100) / 100.0;
    return hoTen + "\n  " + hp1 + "\n  " + hp2 + "\n  DTB = " + dtb;
}

// ===== SinhVien.java =====
public class SinhVien {
    private String hoTen;
    private DiemHP hp1, hp2;

    public SinhVien(String hoTen, DiemHP hp1, DiemHP hp2) {
        this.hoTen = hoTen;
        this.hp1 = hp1;
        this.hp2 = hp2;
    }

    public String getHoTen() { return hoTen; }
    public DiemHP getHp1()   { return hp1; }
    public DiemHP getHp2()   { return hp2; }

    public double tinhDTB() {
        int tc1 = hp1.getSoTinChi();
        int tc2 = hp2.getSoTinChi();
        if (tc1 + tc2 == 0) return 0;
        return (hp1.tinhDiem() * tc1 + hp2.tinhDiem() * tc2) / (tc1 + tc2);
    }

    @Override
    public String toString() {
        double dtb = Math.round(tinhDTB() * 100) / 100.0;
        return hoTen + "\n  " + hp1 + "\n  " + hp2 + "\n  DTB = " + dtb;
    }
}

// ===== QuanLyHP.java =====
public class QuanLyHP {
    public static void main(String[] args) {
        DiemHP lt1 = new HPLyThuyet("Lap trinh Java", 3, 9, 8, 7);
        DiemHP th1 = new HPThucHanh("Thuc hanh Java", 2, 8, 9, 7);

        DiemHP th2 = new HPThucHanh("Thuc hanh Java", 2, 6, 7, 8);
        DiemHP lt2 = new HPLyThuyet("Toan roi rac", 3, 10, 9, 8);

        DiemHP lt3 = new HPLyThuyet("Co so du lieu", 4, 5, 6, 7);
        DiemHP th3 = new HPThucHanh("Thuc hanh CSDL", 1, 10, 10, 9);

        SinhVien[] ds = new SinhVien[3];
        ds[0] = new SinhVien("Nguyen Van An", lt1, th1);
        ds[1] = new SinhVien("Tran Thi Binh", th2, lt2);
        ds[2] = new SinhVien("Le Van Chi", lt3, th3);

        for (int i = 0; i < ds.length; i++) {
            System.out.println(ds[i]);
            System.out.println();
        }

        // Da hinh: cung mot loi goi, moi loai tu tinh
        DiemHP[] cacHP = {lt1, th1, th2, lt2, lt3, th3};
        double tong = 0;
        for (int i = 0; i < cacHP.length; i++) {
            tong += cacHP[i].tinhDiem();
        }
        System.out.println("Tong diem 6 hoc phan: "
                         + Math.round(tong * 100) / 100.0);
    }
}

// ===== HPDoAn.java =====
public class HPDoAn extends DiemHP {
    private double[] diemHoiDong;

    public HPDoAn(String tenHP, int soTinChi, double[] diemHoiDong) {
        super(tenHP, soTinChi);
        this.diemHoiDong = diemHoiDong;
    }

    @Override
    public double tinhDiem() {
        if (diemHoiDong == null || diemHoiDong.length == 0) return 0;
        double s = 0;
        for (int i = 0; i < diemHoiDong.length; i++) s += diemHoiDong[i];
        return s / diemHoiDong.length;
    }
}

public class HPThucHanh extends DiemHP {
    private double[] db;                      // thay 3 biến bằng mảng

    public HPThucHanh(String tenHP, int soTinChi, double[] db) {
        super(tenHP, soTinChi);
        this.db = db;
    }

    @Override
    public double tinhDiem() {
        if (db == null || db.length == 0) return 0;
        double s = 0;
        for (int i = 0; i < db.length; i++) s += db[i];
        return s / db.length;                 // chia theo so bai thuc te
    }
}

private DiemHP[] dsHP;
private int soHP;

public boolean themHP(DiemHP hp) {
    if (hp == null || soHP >= dsHP.length) return false;
    dsHP[soHP++] = hp;
    return true;
}

public double tinhDTB() {
    double t = 0; int tc = 0;
    for (int i = 0; i < soHP; i++) {
        t  += dsHP[i].tinhDiem() * dsHP[i].getSoTinChi();
        tc += dsHP[i].getSoTinChi();
    }
    return (tc == 0) ? 0 : t / tc;
}

public abstract class BuuPham {
    private String ma;
    public BuuPham(String ma) { this.ma = ma; }
    public String getMa() { return ma; }
    public abstract double phiGui();
    public abstract String loai();

    @Override
    public String toString() {
        return ma + " | " + loai() + " | " + phiGui();
    }
}

public double phiGui() { return baoDam ? 2000 : 800; }
public String loai()   { return baoDam ? "Thu bao dam" : "Thu thuong"; }

public double phiGui() { return 5000; }
public String loai()   { return "Buu kien"; }

public double tongTien() {
    double t = 0;
    for (int i = 0; i < soLuong; i++) t += ds[i].phiGui();
    return t;
}

public double tongTheoLoai(String loai) {
    double t = 0;
    for (int i = 0; i < soLuong; i++)
        if (ds[i].loai().equals(loai)) t += ds[i].phiGui();
    return t;
}

// ===== BuuPham.java =====
public abstract class BuuPham {
    private String ma;

    public BuuPham(String ma) { this.ma = ma; }

    public String getMa() { return ma; }

    public abstract double phiGui();
    public abstract String loai();

    @Override
    public String toString() {
        return ma + " | " + loai() + " | " + phiGui();
    }
}

// ===== Thu.java =====
public class Thu extends BuuPham {
    private boolean baoDam;

    public Thu(String ma, boolean baoDam) {
        super(ma);
        this.baoDam = baoDam;
    }

    @Override
    public double phiGui() { return baoDam ? 2000 : 800; }

    @Override
    public String loai() { return baoDam ? "Thu bao dam" : "Thu thuong"; }
}

// ===== BuuKien.java =====
public class BuuKien extends BuuPham {
    public BuuKien(String ma) { super(ma); }

    @Override
    public double phiGui() { return 5000; }

    @Override
    public String loai() { return "Buu kien"; }
}

// ===== ThungThu.java =====
public class ThungThu {
    private BuuPham[] ds;
    private int soLuong;

    public ThungThu(int sucChua) {
        ds = new BuuPham[sucChua];
        soLuong = 0;
    }

    public boolean them(BuuPham p) {
        if (p == null || soLuong >= ds.length) return false;
        ds[soLuong] = p;
        soLuong++;
        return true;
    }

    public void lietKe() {
        for (int i = 0; i < soLuong; i++) System.out.println(ds[i]);
    }

    public void lietKeTheoLoai(String loai) {
        for (int i = 0; i < soLuong; i++) {
            if (ds[i].loai().equals(loai)) System.out.println(ds[i]);
        }
    }

    public double tongTien() {
        double t = 0;
        for (int i = 0; i < soLuong; i++) t += ds[i].phiGui();
        return t;
    }

    public double tongTheoLoai(String loai) {
        double t = 0;
        for (int i = 0; i < soLuong; i++) {
            if (ds[i].loai().equals(loai)) t += ds[i].phiGui();
        }
        return t;
    }

    public int getSoLuong() { return soLuong; }
}

// ===== QuanLyBuuPham.java =====
public class QuanLyBuuPham {
    public static void main(String[] args) {
        ThungThu thung = new ThungThu(100);

        thung.them(new Thu("T1", false));
        thung.them(new Thu("T2", false));
        thung.them(new Thu("T3", false));
        thung.them(new Thu("T4", true));
        thung.them(new Thu("T5", true));
        thung.them(new BuuKien("B1"));
        thung.them(new BuuKien("B2"));
        thung.them(new BuuKien("B3"));

        System.out.println("--- Tat ca buu pham ---");
        thung.lietKe();

        System.out.println("--- Thu bao dam ---");
        thung.lietKeTheoLoai("Thu bao dam");

        System.out.println("Tong tien: " + thung.tongTien());
        System.out.println("Thu thuong : " + thung.tongTheoLoai("Thu thuong"));
        System.out.println("Thu bao dam: " + thung.tongTheoLoai("Thu bao dam"));
        System.out.println("Buu kien   : " + thung.tongTheoLoai("Buu kien"));
        System.out.println("So luong   : " + thung.getSoLuong());
    }
}