using System; using static System.Console; using System.Linq; using System.Collections.Generic; class Program { static int NN => int.Parse(ReadLine()); static int[] NList => ReadLine().Split().Select(int.Parse).ToArray(); public static void Main() { Solve(); // Test(); } static void Test() { var r = new Random(); var n = 200000; var k = 100000; var a = new int[n]; for (var i = 0; i < n; ++i) a[i] = r.Next(1, 1000000000); var start = DateTime.Now; WriteLine(Sushi(n, k, a)); WriteLine((DateTime.Now - start).TotalSeconds); } static void Solve() { var c = NList; var (n, k) = (c[0], c[1]); var a = NList; WriteLine(Sushi(n, k, a)); } static long Sushi(int n, int k, int[] a) { var set = new CMultiSet(); set.Insert(0); var dlist = new long[n + 1]; for (var i = 0; i < n; ++i) { var min = set.ElementAt(0); dlist[i + 1] = min + a[i]; set.Insert(dlist[i + 1]); if (i + 1 - k >= 0) set.Remove(dlist[i + 1 - k]); } var ans = 0L; foreach (var ai in a) ans += ai; return (ans - set.ElementAt(0)); } public class CSet where T : IComparable { protected SB_BST.Node _root; public T this[int idx]{ get { return ElementAt(idx); } } public int Count() { return SB_BST.Count(_root); } public virtual void Insert(T v) { if (_root == null) _root = new SB_BST.Node(v); else { if (SB_BST.Find(_root, v) != null) return; _root = SB_BST.Insert(_root, v); } } public void Clear() { _root = null; } public void Remove(T v) { _root = SB_BST.Remove(_root, v); } public bool Contains(T v) { return SB_BST.Contains(_root, v); } public T ElementAt(int k) { var node = SB_BST.FindByIndex(_root, k); if (node == null) throw new IndexOutOfRangeException(); return node.Value; } public int Count(T v) { return SB_BST.UpperBound(_root, v) - SB_BST.LowerBound(_root, v); } /// 指定した値以上の要素のうち最小のインデックスを取得 public int LowerBound(T v) { return SB_BST.LowerBound(_root, v); } /// 指定した値より大きい要素のうち最小のインデックスを取得 public int UpperBound(T v) { return SB_BST.UpperBound(_root, v); } public Tuple EqualRange(T v) { if (!Contains(v)) return new Tuple(-1, -1); return new Tuple(SB_BST.LowerBound(_root, v), SB_BST.UpperBound(_root, v) - 1); } public List ToList() { return new List(SB_BST.Enumerate(_root)); } } public class CMultiSet : CSet where T : IComparable { public override void Insert(T v) { if (_root == null) _root = new SB_BST.Node(v); else _root = SB_BST.Insert(_root, v); } } public class SB_BST where T : IComparable { public class Node { public T Value; public Node LChild; public Node RChild; public int Count; //size of the sub tree public Node(T v) { Value = v; Count = 1; } } static Random _rnd = new Random(); public static int Count(Node t) { return t == null ? 0 : t.Count; } static Node Update(Node t) { t.Count = Count(t.LChild) + Count(t.RChild) + 1; return t; } public static Node Merge(Node l, Node r) { if (l == null || r == null) return l == null ? r : l; if ((double)Count(l) / (double)(Count(l) + Count(r)) > _rnd.NextDouble()) { l.RChild = Merge(l.RChild, r); return Update(l); } else { r.LChild = Merge(l, r.LChild); return Update(r); } } /// /// split as [0, k), [k, n) /// public static Tuple Split(Node t, int k) { if (t == null) return new Tuple(null, null); if (k <= Count(t.LChild)) { var s = Split(t.LChild, k); t.LChild = s.Item2; return new Tuple(s.Item1, Update(t)); } else { var s = Split(t.RChild, k - Count(t.LChild) - 1); t.RChild = s.Item1; return new Tuple(Update(t), s.Item2); } } public static Node Remove(Node t, T v) { if (Find(t, v) == null) return t; return RemoveAt(t, LowerBound(t, v)); } public static Node RemoveAt(Node t, int k) { var s = Split(t, k); var s2 = Split(s.Item2, 1); return Merge(s.Item1, s2.Item2); } public static bool Contains(Node t, T v) { return Find(t, v) != null; } public static Node Find(Node t, T v) { while (t != null) { var cmp = t.Value.CompareTo(v); if (cmp > 0) t = t.LChild; else if (cmp < 0) t = t.RChild; else break; } return t; } public static Node FindByIndex(Node t, int idx) { if (t == null) return null; var currentIdx = Count(t) - Count(t.RChild) - 1; while (t != null) { if (currentIdx == idx) return t; if (currentIdx > idx) { t = t.LChild; currentIdx -= (Count(t == null ? null : t.RChild) + 1); } else { t = t.RChild; currentIdx += (Count(t == null ? null : t.LChild) + 1); } } return null; } public static int UpperBound(Node t, T v) { var torg = t; if (t == null) return -1; var ret = Int32.MaxValue; var idx = Count(t) - Count(t.RChild) - 1; while (t != null) { var cmp = t.Value.CompareTo(v); if (cmp > 0) { ret = Math.Min(ret, idx); t = t.LChild; idx -= (Count(t == null ? null : t.RChild) + 1); } else if (cmp <= 0) { t = t.RChild; idx += (Count(t == null ? null : t.LChild) + 1); } } return ret == Int32.MaxValue ? Count(torg) : ret; } public static int LowerBound(Node t, T v) { var torg = t; if (t == null) return -1; var idx = Count(t) - Count(t.RChild) - 1; var ret = Int32.MaxValue; while (t != null) { var cmp = t.Value.CompareTo(v); if (cmp >= 0) { if (cmp == 0) ret = Math.Min(ret, idx); t = t.LChild; if (t == null) ret = Math.Min(ret, idx); idx -= t == null ? 0 : (Count(t.RChild) + 1); } else if (cmp < 0) { t = t.RChild; idx += (Count(t == null ? null : t.LChild) + 1); if (t == null) return idx; } } return ret == Int32.MaxValue ? Count(torg) : ret; } public static Node Insert(Node t, T v) { var ub = LowerBound(t, v); return InsertByIdx(t, ub, v); } static Node InsertByIdx(Node t, int k, T v) { var s = Split(t, k); return Merge(Merge(s.Item1, new Node(v)), s.Item2); } public static IEnumerable Enumerate(Node t) { var ret = new List(); Enumerate(t, ret); return ret; } static void Enumerate(Node t, List ret) { if (t == null) return; Enumerate(t.LChild, ret); ret.Add(t.Value); Enumerate(t.RChild, ret); } } }