public class MyComparer : IComparer<int>
{
	public int? LowerBound;
	public void Reset()
	{
		LowerBound = null;
	}
	public int Compare(int x, int y)
	{
		if (y >= x)
		{
			if (LowerBound == null ||LowerBound > y)
			{
				LowerBound = y;
			}
		}
		return (x < y ? -1 : x == y ? 0 : 1);
	}
}