public void Run()
{
Console.WriteLine("---------------CITC_exercices.Chapter03 - Q03_2---------------");
Console.WriteLine("Implement stack that always keeps min and you can get it in O(1)" + Environment.NewLine);
StackWithMin stack = new StackWithMin();
stack.Push(2);
stack.Push(3);
stack.Push(4);
stack.Push(5);
stack.Push(1);
stack.Push(6);
stack.Pop();
stack.Pop();
stack.Push(1);
NodeWithMin top = stack.Peek();
StringBuilder sb = new StringBuilder();
sb.Append("{ ");
while (top != null)
{
sb.Append(top.Value + " ");
top = top.Next;
}
sb.Append("}");
Console.WriteLine(sb + " : " + stack.Min());
Console.WriteLine();
}
public NodeWithMin Pop()
{
if (_top == null)
{
return(null);
}
NodeWithMin n = _top;
_top = _top.Next;
return(n);
}
public void Push(int value)
{
NodeWithMin n = new NodeWithMin
{
Value = value,
};
if (_top == null)
{
n.Min = value;
n.Next = null;
_top = n;
return;
}
n.Min = value < _top.Min ? value : _top.Min;
n.Next = _top;
_top = n;
}
