using System; using System.Collections.Generic; using System.Collections;
public static class CollectionUtils
{
public static T[] Join<T>(params IEnumerable<T>[] srcs)
{ if (srcs.Length == 0) return new T[0];
List<T> res = new List<T>(srcs[0]); for (int i = 1; i < srcs.Length; i++)
res.AddRange(srcs[i]); return res.ToArray();
}