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

You can use the index to get the previous item and calculate the group id out of comparing the values. Then group on the group ids and get the values out:

List data = new List { 1, 2, 1, 2, 3, 1, 2, 3, 4, 1, 2, 3, 4, 5, 6 };

int groupId = 0;
var groups = data.Select
                 ( (item, index)
                   => new
                      { Item = item
                      , Group = index > 0 && item <= data[index - 1] ? ++groupId : groupId
                      }
                 );

List> list = groups.GroupBy(g => g.Group)
                             .Select(x => x.Select(y => y.Item).ToList())
                             .ToList();