Split a list into multiple lists at increasing sequence broken

Question

I\'ve a List of int and I want to create multiple List after splitting the original list when a lower or same number is found. Numbers are not in sorted order.<

Answer 1

This is my simple loop approach using some yields :

static IEnumerable<IList<int>> Split(IList<int> data) { if (data.Count == 0) yield break; List<int> curr = new List<int>(); curr.Add(data[0]); int last = data[0]; for (int i = 1; i < data.Count; i++) { if (data[i] <= last) { yield return curr; curr = new List<int>(); } curr.Add(data[i]); last = data[i]; } yield return curr; }

Answer 2

I have modified your code, and now working fine:

        List<int> data = new List<int> { 1, 2, 1, 2, 3,3, 1, 2, 3, 4, 1, 2, 3, 4, 5, 6 };
        List<List<int>> resultLists = new List<List<int>>();
        int last = 0;
        int count = 0;

        var res = data.Where((p, i) =>
        {
            if (i > 0)
            {
                if (p > last && p!=last)
                {
                    resultLists[count].Add(p);
                }
                else
                {
                    count++;
                    resultLists.Add(new List<int>());
                    resultLists[count].Add(p);
                }
            }
            else
            {
                resultLists.Add(new List<int>());
                resultLists[count].Add(p);
            }



            last = p;
            return true;
        }).ToList();

Answer 3

This is not a typical LINQ operation, so as usual in such cases (when one insists on using LINQ) I would suggest using Aggregate method:

var result = data.Aggregate(new List<List<int>>(), (r, n) =>
{
    if (r.Count == 0 || n <= r.Last().Last()) r.Add(new List<int>());
    r.Last().Add(n);
    return r;
});