static void Main()
{
var result = new StringBuilder();
var queue = new BucketList <string>();
var names = new Dictionary <string, int>();
var input = Console.ReadLine();
var currentCommand = Command.Parse(input);
while (true)
{
string name = string.Empty;
switch (currentCommand.Name)
{
case "Append":
name = currentCommand.Parameters[0];
AddName(names, name);
queue.Add(name);
result.AppendLine("OK");
break;
case "Insert":
var position = int.Parse(currentCommand.Parameters[0]);
name = currentCommand.Parameters[1];
AddName(names, name);
if (position > queue.Size || position < 0)
{
result.AppendLine("Error");
break;
}
queue.Insert(position, name);
result.AppendLine("OK");
break;
case "Find":
name = currentCommand.Parameters[0];
if (!names.ContainsKey(name))
{
result.AppendLine("0");
}
else
{
result.AppendLine(names[name].ToString());
}
break;
case "Serve":
var count = int.Parse(currentCommand.Parameters[0]);
if (count > queue.Size || count < 0)
{
result.AppendLine("Error");
break;
}
var currentResult = new List <string>();
for (int i = 0; i < count; i++)
{
currentResult.Add(queue[0]);
queue.Remove(0);
}
for (int i = 0; i < currentResult.Count; i++)
{
names[currentResult[i]]--;
}
result.AppendLine(string.Join(" ", currentResult));
break;
case "End":
Console.WriteLine(result.ToString());
return;
}
input = Console.ReadLine();
currentCommand = Command.Parse(input);
}
}
