[国の原稿項目]Utils Class(1)

namespace Utils
{
    public static class Utils
    {
        public static void AppendArray<T>(ref T[] a, T[] b)
        {
            T[] arr = new T[a.Length + b.Length];

            for(int i = 0; i < a.Length; i++)
            {
                arr[i] = a[i];
            }

            for(int i = a.Length; i < a.Length + b.Length; i++)
            {
                arr[i] = b[i - a.Length];
            }

            a = arr;
        }

        public static void AppendArray<T>(ref T[] a, T b)
        {
            T[] arr = new T[a.Length + 1];

            for(int i = 0; i < a.Length; i++)
            {
                arr[i] = a[i];
            }

            arr[a.Length] = b;

            a = arr;
        }
    }
}