private void MultiSetRemoveAt()
{
for (int i = 0; i < count; i++)
{
multiSet.RemoveAt(multiSet.Count - 1);
}
}
static object Solve()
{
var(n, k) = Read2();
var s = Console.ReadLine();
var r = new List <char>();
var comp = Comparer2 <int> .Create(i => s[i], i => i);
var set = new IndexedMultiSet <int>(comp);
for (int i = 0; i < n - k; i++)
{
set.Add(i);
}
var t = -1;
for (int i = n - k; i < n; i++)
{
set.Add(i);
while (set.GetFirst() < t)
{
set.RemoveAt(0);
}
t = set.RemoveAt(0);
r.Add(s[t]);
}
return(string.Join("", r));
}
public void RemoveAt()
{
set.RemoveAt(0);
Assert.AreEqual(6, set.Count);
AssertItemsOrder();
set.Add(10);
set.RemoveAt(2);
Assert.AreEqual(6, set.Count);
AssertItemsOrder();
set.Insert(0, -1);
set.Add(-1);
set.RemoveAt(0);
Assert.AreEqual(7, set.Count);
Assert.IsTrue(set.Contains(-1));
AssertItemsOrder();
set.RemoveAt(0);
Assert.AreEqual(6, set.Count);
Assert.IsFalse(set.Contains(-1));
AssertItemsOrder();
}