using System using System Collections using System Collections Generic

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using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
class MyClass<T> : IEnumerable
where T : IComparable<T>
{
private T[] array;
private int[] indexNext;
private int first;
private int capacity;
public bool IsReversed { get; private set; }
public int Size { get; private set; }
public MyClass(){
capacity = 10;
array = new T[capacity];
indexNext = new int[capacity];
first = -1;
Size = 0;
IsReversed = false;
}
public void push(T obj)
{
if (Size == capacity)
{
capacity *= 2;
T[] tmpT = new T[capacity];
array.CopyTo(tmpT, 0);
array = tmpT;
int[] tmpI = new int[capacity];
indexNext.CopyTo(tmpI, 0);
indexNext = tmpI;
}
array[Size] = obj;
int prevInd = -1;
int curInd = first;
while (curInd != -1 && array[curInd].CompareTo(obj) * (IsReversed? -1 : +1) <= 0)
{
prevInd = curInd;
curInd = indexNext[prevInd];
}
if (prevInd == -1)
{
indexNext[Size] = first;
first = Size;
}
else
{
indexNext[Size] = indexNext[prevInd];
indexNext[prevInd] = Size;
}
++Size;
}
public void pop()
{
if (Size == 0){
throw new Exception("Zero Size ex.");
}
if (first == Size - 1){
first = indexNext[Size - 1];
}
for (int i = 0; i < Size; ++i)
{
if (indexNext[i] == Size - 1)
{
indexNext[i] = indexNext[Size - 1];
break;
}
}
indexNext[Size] = -1;
array[Size] = default(T);
--Size;
}
public T this[int pos]
{
get
{
if (pos < 0 || pos >= Size)
{
throw new Exception("Wrong array index");
}
int index = first;
for (int i = 0; i < pos; ++i)
{
index = indexNext[index];
}
return array[index];
}
}
public IEnumerator GetEnumerator()
{
for (int i = first; i != -1; i = indexNext[i])
yield return array[i];
}
public T getElementAtRealPos(int pos){
if (pos < 0 || pos >= Size)
{
throw new Exception("Wrong array index");
}
return array[pos];
}
public void debugPrntIndexNxt()
{
for (int i = 0; i < Size; ++i)
Console.Write("{0,4:d}",indexNext[i]);
Console.WriteLine();
}
public void revese()
{
IsReversed = !IsReversed;
int prevInd = -1;
int curInd = first;
while (curInd != -1)
{
int t = curInd;
curInd = indexNext[curInd];
indexNext[t] = prevInd;
prevInd = t;
}
first = prevInd;
}
}
class Program
{
static void Main(string[] args)
{
int[] inputData = new int[] { 1, 2, 3, -1, -2, -3, 0, 2 };
MyClass<int> myClassInstance = new MyClass<int>();
foreach (int x in inputData)
{
myClassInstance.push(x);
Console.Write("{0,4:d}", x);
}
Console.WriteLine();
foreach (int x in myClassInstance)
{
Console.Write("{0,4:d}", x);
}
Console.WriteLine();
myClassInstance.debugPrntIndexNxt();
Console.WriteLine("REVERSE");
myClassInstance.revese();
foreach (int x in myClassInstance){
Console.Write("{0,4:d}", x);
}
Console.WriteLine();
myClassInstance.debugPrntIndexNxt();
}
}