using System;
using System.Collections;
using System.Collections.Generic;

namespace Container
{
    public class FixedRow<T> : IEnumerable<T> 
    {
        int fixSize;

        T[] data;

        public int Count => data.Length;
        public T this[int index] => data[index];

        public FixedRow(int fixSize)
        {
            data = new T[0];
            this.fixSize = fixSize;
        }

        public void PushBack(T v)
        {
            if (data.Length >= fixSize) return;

            T[] newData = new T[data.Length + 1];
            Array.Copy(data, newData, data.Length);
            newData[data.Length] = v;

            data = newData;
        }

        public IEnumerator<T> GetEnumerator() => ((IEnumerable<T>)data).GetEnumerator();
        IEnumerator IEnumerable.GetEnumerator() => data.GetEnumerator();
    }

    public class HorizontalDataMatrix<T> : IEnumerable<FixedRow<T>>
    {
        int columnCount;
        int count;

        List<FixedRow<T>> data;

        public int ColumnCount => columnCount;
        public int RowCount => data.Count;
        public int Count => count;

        public FixedRow<T> this[int index] => data[index];
        public T this[int row, int column] => data[row][column];

        public HorizontalDataMatrix(int columnCount)
        {
            this.columnCount = columnCount;
            data = new List<FixedRow<T>>();
            count = 0;
        }

        public HorizontalDataMatrix(IEnumerable<T> source, int columnCount)
        {
            this.columnCount = columnCount;
            data = new List<FixedRow<T>>();
            count = 0;

            foreach (var v in source)
                PushBack(v);
        }

        public void PushBack(T v)
        {
            int row = count / columnCount;

            if (row >= data.Count)
                data.Add(new FixedRow<T>(columnCount));

            data[row].PushBack(v);
            ++count;
        }

        public bool TryGetValue(int row, int column, out T value)
        {
            value = default;

            if (row < 0 || row >= data.Count) return false;
            if (column < 0 || column >= data[row].Count) return false;

            value = data[row][column];
            return true;
        }

        public IEnumerator<FixedRow<T>> GetEnumerator() => data.GetEnumerator();
        IEnumerator IEnumerable.GetEnumerator() => data.GetEnumerator();
    }
}