리스트의 아이템을 쪼개서 식구 늘이기

List<string> orgList = new List<string>();
orgList.Add("0");
orgList.Add("1");
orgList.Add("2");
orgList.Add("3");
orgList.Add("4");
orgList.Add("5");
 
List<Tuple<int, List<string>>> haveList = new List<Tuple<int, List<string>>>();
List<string> tList;
 
tList = new List<string>();
tList.Add("0-1");
tList.Add("0-2");
tList.Add("0-3");
haveList.Add(new Tuple<int, List<string>>(0, tList));
 
tList = new List<string>();
tList.Add("2-1");
tList.Add("2-2");
tList.Add("2-3");
haveList.Add(new Tuple<int, List<string>>(2, tList));
 
tList = new List<string>();
tList.Add("5-1");
tList.Add("5-2");
tList.Add("5-3");
haveList.Add(new Tuple<int, List<string>>(5, tList));
 
haveList.Reverse();
foreach(var item in haveList)
{
    orgList.InsertRange(item.Item1, item.Item2);
    orgList.RemoveAt(item.Item1 + item.Item2.Count());
}

결과

index[0] : 0-1
index[1] : 0-2
index[2] : 0-3
index[3] : 1
index[4] : 2-1
index[5] : 2-2
index[6] : 2-3
index[7] : 3
index[8] : 4
index[9] : 5-1
index[10] : 5-2
index[11] : 5-3