using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public class Stat<T> where T:struct,IComparable

    {

        public T? Min{get;set;}

        public T? Max{get;set;}

        public int Nb{get;set;}

        public T? Sum{get;set;}

        public T? Mut{get;set;}

        public IDictionary<T,int>Occurences{get;set;}

        public Stat(){

            Occurences = new Dictionary<T,int>();

        }

        public override string ToString(){

            var occ = string.Join(",",Occurences.Select(o=>string.Format("({0}:{1})",o.Key,o.Value)));

            return string.Format("Min = {0} Max = {1} Nb = {2} Sum={4} Mut={5} Occ=[{3}]" ,Min,Max,Nb,occ,Sum,Mut); 

        }

    }

    public static void Main()

    {

        var liste = new List<int>{2,54,5,45,78,54,2,6,47,65,25,41,20,32,12,78};

        var agg = liste.Aggregate(new Stat<int>(),(a,n) => { 

            if(n> a.Max || a.Max==null)a.Max=n;

            if(n<a.Min || a.Min==null)a.Min=n; 

            a.Nb++;

            if(a.Occurences.ContainsKey(n))a.Occurences[n]++;

            else a.Occurences.Add(n,1);

            if(a.Sum==null)a.Sum=0;

            a.Sum += n;

            //if(n!=0)

            //{

            //  if(a.Mut==null)a.Mut=1;

            //  a.Mut *= n;

            //}

            return a;

        });

        Console.WriteLine(agg.ToString());

    }

}