// Array
Array.Sort(nums);
Array.Sort(nums, (x, y) => x.CompareTo(y));
var nums = new [] { 0, 1, 2 };
var sum = nums[0..1].Sum();
var sum = nums[..2].Sum();
// Stack
var s = new Stack<int>();
s.Push(1);
s.Pop();
// Queue
var q = new Queue<int>();
q.Enqueue(1);
q.Dequeue();
// HashSet
var set = new HashSet<int>();
set.Add(1);
set.Remove(1);
set.Contains(1);
// Dictionary
var dic = new Dictionary<string, int>();
dic.Add("1", 1);
dic.Remove("1");
dic.ContainsKey("1");
dic.ContainsValue(1);
// SortedList
var descendingComparer = Comparer<string>.Create((x, y) => y.CompareTo(x));
var sortedList = new SortedList<string, string>(descendingComparer);
sortedList.Add("key", "c");
var item1 = sortedList["key"]
var item2 = sortedList.ElementAt(0);
sortedList.Remove(0);
sortedList.RemoveAt(0);
// PriorityQueue
var pq = new PriorityQueue<string, int>();
pq.Enqueue("a", 3);
pq.Dequeue();
