Size

using System;

namespace Shapes
{
    struct size
    {
        public int H { get; set; }
        public int W { get; set; }
        public override string ToString()
        {
            return String.Format("{0} {1}", H, W);
        }

        public size(int a, int b)
        {
            H = a;
            W = b;
        }

        public static size operator +(size sz1, size sz2)
        {
            return new size(sz1.H + sz2.H, sz1.W + sz2.W);
        }
    }
    struct point
    {
        int x, y;
        public override string ToString()
        {
            return String.Format("{0} {1}", x, y);
        }

        public point(int a, int b)
        {
            x = a;
            y = b;
        }
        public point(size sz)
        {
            x = sz.H;
            y = sz.W;
        }
        public static point operator +(point pt, size sz)
        {
            return new point(pt.x + sz.H, pt.y + sz.W);
        }

        public static explicit operator size(point pt)
        {
            return new size(pt.x, pt.y);
        }
    }
    class SizeList
    {
        size[] s;
        public SizeList(size[] a)
        {
            s = a;
        }
        public static SizeList operator +(SizeList sl1, SizeList sl2)
        {
            size[] output = new size[sl1.s.Length];
            for (int i = 0; i < sl1.s.Length; i++)
                output[i] = sl1.s[i] + sl2.s[i];
            return new SizeList(output);
        }
        public System.Collections.IEnumerator GetEnumerator()
        {
            for (int i = 0; i < s.Length; i++)
            {
                yield return s[i];
            }
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            size s1 = new size(5, 9);
            size s2 = new size(2, 1);
            Console.WriteLine(s1 + s2);
            point p1 = new point(3, 4);
            point p2 = new point(s2 + s1);
            Console.WriteLine(p2 + s2);
            SizeList szl1 = new SizeList(new size[]{ s1, s2 });
            SizeList szl2 = new SizeList(new size[] {(size)p1, (size)p2});
            foreach (size s in szl1)
                Console.Write(s + ";");
            Console.WriteLine();
            foreach (size s in szl2)
                Console.Write(s + ";");
            Console.WriteLine();
            foreach (size s in szl1 + szl2)
                Console.Write(s + ";");
        }
    }
}