C# search a nonbinary tree for common ancestor +nonbinary
public class Node<T> where T:IComparable
{
public T Value { get; set; }
public IList<Node<T>> Children { get; set; }
public override string ToString()
{
return Value.ToString();
}
public static Func<T, Node<T>, Node<T>> GetFindFirstFunc()
{
Func<T, Node<T>,Node<T>> func = null;
func = (value,currentNode) =>
{
if (currentNode.Value.CompareTo(value) == 0)
{
return currentNode;
}
if (currentNode.Children != null)
{
foreach (var child in currentNode.Children)
{
var result = func(value, child);
if (result != null)
{
//found the first match, pass that out as the return value as the call stack unwinds
return result;
}
}
}
return null;
};
return func;
}
public static Func<T, Node<T>, IEnumerable<Node<T>>> GetFindAllFunc()
{
Func<T, Node<T>, IEnumerable<Node<T>>> func = null;
List<Node<T>> matches = new List<Node<T>>();
func = (value, currentNode) =>
{
//capture the matches List<Node<T>> in a closure so that we don't re-create it recursively every time.
if (currentNode.Value.CompareTo(value) == 0)
{
matches.Add(currentNode);
}
if (currentNode.Children != null)
{
//process all nodes
foreach (var child in currentNode.Children)
{
func(value, child);
}
}
return matches;
};
return func;
}
}