02. Average Student Grades

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

namespace _02.Average_Student_Grades
{
    class Program
    {
        static void Main(string[] args)
        {
            var n = int.Parse(Console.ReadLine());
            var student = new Dictionary<string, List<double>>();

            for (int i = 0; i < n; i++)
            {
                var input = Console.ReadLine().Split();
                var name = input[0];
                var grade = double.Parse(input[1]);

                if (!student.ContainsKey(name))
                {
                    student[name] = new List<double>();
                }
                    student[name].Add(grade);
            }
            foreach (var pair in student)
            {
                var name = pair.Key;
                var studentsGrade = pair.Value;
                var average = studentsGrade.Average();
                Console.Write("{0} -> ", name);

                foreach (var item in studentsGrade)
                {
                    Console.Write("{0:F2} ",item);
                }
                Console.WriteLine("(avg: {0:F2})", average);
            }
        }
    }
}