//第六周練習題 第三版參考解答 

using System;

namespace homework6
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("請輸入班級人數");
            int peopleNum = int.Parse(Console.ReadLine());
            int[,] score = new int[peopleNum, 3];

            for (int i = 0; i < peopleNum; i++)
            {
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的期中考成績");
                score[i, 0] = int.Parse(Console.ReadLine());
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的期末考成績");
                score[i, 1] = int.Parse(Console.ReadLine());
                Console.WriteLine("請輸入第" + (i + 1) + "位同學的作業成績");
                score[i, 2] = int.Parse(Console.ReadLine());
            }


            Console.WriteLine("編號\t期中考\t期末考\t作業\t總成績\t名次");
            Console.WriteLine("--------------------------------------------");
            double[] Final = new double[peopleNum];
            double[] FinalCopy = new double[peopleNum];
            int[] seq = new int[peopleNum];

            //先計算總成績
            for (int i = 0; i < peopleNum; i++)
            {
                Final[i] = (double) score[i, 0]*0.4 + score[i, 1]*0.4 + score[i, 2]*0.2;
                FinalCopy[i] = Final[i];
            }

            int idx = 0;
            //計算名次
            Array.Sort(FinalCopy);
            Array.Reverse(FinalCopy);
            for (int i = 0; i < peopleNum; i++)
            {
                idx = Array.IndexOf(FinalCopy, Final[i]);
                seq[i] = idx + 1;
            }

            //印出個人成績和名次
            for (int i = 0; i < peopleNum; i++)
            {

                Console.Write((i + 1) + "\t" + score[i, 0]);
                Console.Write("\t" + score[i, 1]);
                Console.Write("\t" + score[i, 2]);
                Console.Write("\t" + "{0:F2}", Final[i]);
                Console.Write("\t" + seq[i] + "\n");
            }

            double midexam = 0;
            double finexam = 0;
            double hw = 0;

            for (int j = 0; j < peopleNum; j++)
            {
                midexam += score[j, 0];
                finexam += score[j, 1];
                hw += score[j, 2];
            }
            midexam /= peopleNum;
            finexam /= peopleNum;
            hw /= peopleNum;

            //印出各科平均
            Console.WriteLine("--------------------------------------------");
            Console.Write("平均" + "\t" + "{0:F2}", midexam);
            Console.Write("\t" + "{0:F2}", finexam);
            Console.Write("\t" + "{0:F2}", hw);
            Console.Write("\n");
        }
    }
}