public void Test2()
{
var root = new BinaryNodeWithParent()
{
Value = 10
};
root.Left = new BinaryNodeWithParent()
{
Value = 2, Parent = root
};
var fifteen = new BinaryNodeWithParent()
{
Value = 15, Parent = root
};
fifteen.Left = new BinaryNodeWithParent()
{
Value = 12, Parent = fifteen
};
fifteen.Right = new BinaryNodeWithParent()
{
Value = 18, Parent = fifteen
};
root.Right = fifteen;
var nextInOrder = FindInOrderSuccessor.Find(fifteen.Left as BinaryNodeWithParent);
Assert.That(nextInOrder.Value, Is.EqualTo(15));
}
public static BinaryNodeWithParent Find(BinaryNodeWithParent node)
{
if (node.Parent == null || node.Parent.Parent == null)
{
return(FindMaxLeft(node));
}
var gpa = node.Parent.Parent;
if (gpa.Value < node.Parent.Value)
{
return(node.Parent);
}
return(gpa);
}
public void Test2()
{
var root = new BinaryNodeWithParent()
{
Value = 1
};
var three = new BinaryNodeWithParent()
{
Value = 3, Parent = root
};
var two = new BinaryNodeWithParent()
{
Value = 2, Parent = root
};
var four = new BinaryNodeWithParent()
{
Value = 4, Parent = three
};
var six = new BinaryNodeWithParent()
{
Value = 6, Parent = three
};
var five = new BinaryNodeWithParent()
{
Value = 5, Parent = six
};
root.Left = three;
root.Right = two;
three.Left = four;
three.Right = six;
six.Left = five;
var impl = new LcaImpl();
var res = impl.Lca(root, three, five);
Assert.That(res.Value, Is.EqualTo(3));
}
public BinaryNodeWithParent Lca(BinaryNodeWithParent root, BinaryNodeWithParent a, BinaryNodeWithParent b)
{
var pathFromA = new HashSet <BinaryNode>();
var tmp = a;
while (tmp != null)
{
pathFromA.Add(tmp);
tmp = tmp = tmp.Parent;
}
tmp = b;
while (tmp != null)
{
if (pathFromA.Contains(tmp))
{
return(tmp);
}
tmp = tmp.Parent;
}
return(null);
}