using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _09._02._2019
{
    class Program
    {
        class Student
        {
            public double ExamPercent { get; private set; } // 0.0−1.0
            public double AttendancePercent { get; private set; } // 0.0−1.0
            public Student(double examPercent, double attendancePercent)
            {
                if (examPercent > 1.0 || attendancePercent > 1.0) throw new ArgumentOutOfRangeException();
                if (examPercent < 0.0 || attendancePercent < 0.0) throw new ArgumentOutOfRangeException();
                ExamPercent = examPercent; AttendancePercent = attendancePercent;
            }
        }

        interface IGrader
        {
            List<bool> CreateNewStudentList(List<Student> student);
            double CalculateAverage(List<Student> student);
        }

        class FeritGrader : IGrader
        {
            public double MinScore { get; private set; }
            public double MinAttendance { get; private set; }
            public FeritGrader(double minScore, double minAttendance)
            {
                //Kontrola granicnih vrijednosti je obavljena, ali izostavljena radi prostora
                MinScore = minScore; MinAttendance = minAttendance;
            }

            public List<bool> CreateNewStudentList(List<Student> student) {
                List<bool> newStudentList = new List<bool>();
                for (int i = 0; i < student.Count(); i++)
                {
                    if(student[i].ExamPercent > MinScore && student[i].AttendancePercent > MinAttendance)
                    {
                        newStudentList.Add(true);
                    }
                    else
                    {
                        newStudentList.Add(false);
                    }
                }
                return newStudentList;
            }

            public double CalculateAverage(List<Student> student) {
                double sum = 0;
                int counter = 0;
                for (int i = 0; i < student.Count(); i++)
                {
                    if (student[i].ExamPercent > MinScore && student[i].AttendancePercent > MinAttendance)
                    {
                        sum = student[i].ExamPercent;
                        counter++;
                    }
                }
                return sum / counter;
            }
        }

        void RemoveStudent(List<Student> student)
        {
            for(int i = 0; i < student.Count(); i++){
                if(student[i].AttendancePercent == 0)
                {
                    student.RemoveAt(i);
                }
            }
        }

        static void Main(string[] args)
        {
            List<Student> students = RetriveStudentsFromISVU();
            int totalStudents = students.Count();
            RemoveStudent(students);
            int newTotal = students.Count();
            if ((totalStudents - newTotal) > totalStudents / 2){
                Console.WriteLine("Studenata kojih nikad nije bilo je manje od pola.");
            }
            else
            {
                Console.WriteLine("Studenata kojih nikad nije bilo je vise od pola.");
            }
        }
    }