Memory.cs

    public class Memory
    {
        public Dictionary<long, long> Storage = new Dictionary<long, long>();
        public int Size => Storage.Count;

        public Memory(long[] input)
        {
            for (var i = 0; i < input.Length; i++)
            {
                Storage.Add(i, input[i]);
            }
        }

        public long Get(long index) =>
            Storage.ContainsKey(index) ? Storage[index] : 0;

        public void Set(long index, long value)
        {
            if (Storage.ContainsKey(index)) { Storage[index] = value; }
            else { Storage.Add(index, value); }
        }

        public long[] SaveMemory()
        {
            var toReturn = new long[Storage.Keys.Max() + 1];
            
            for (var i = (long)0; i < toReturn.Length; i++)
            {
                toReturn[i] = Get(i);
            }

            return toReturn;
        }

        public static Memory FromCSV(string s) =>
            new Memory(s.Split(',').ToList().ConvertAll(a => long.Parse(a)).ToArray());

        public static Memory FromPath(string s) =>
            FromCSV(File.ReadAllText(s));

        public static Memory FromArray(long[] input) =>
            new Memory(input);
    }