/// <summary>
/// Compares the two lists gathered from node1 and node2 via the SearchPath(FTNode n) method
/// to find the lowest common ancestor.
/// Writes the result to console.
/// </summary>
/// <param name="node1">one of the two nodes we want to find the LCA for</param>
/// <param name="node2">the other node we want to find the LCA for</param>
public void LowerCommonAncestor(FTNode node1, FTNode node2)
{
var node1path = SearchPath(node1);
var node2path = SearchPath(node2);
// Assigns lowest Count path to node1path so we can output s1 with no problem.
if (node1path.Count > node2path.Count)
{
var temp = node1path;
node1path = node2path;
node2path = temp;
}
var counter = 0;
string s1 = node1path[counter].name;
string s2 = node2path[counter].name;
while (s1 == s2 && counter < node1path.Count && counter < node2path.Count)
{
s1 = node1path[counter].name;
s2 = node2path[counter].name;
counter++;
}
Console.WriteLine(s1);
}
/// <summary>
/// Searches a FamilyTree for FTNode n, in a bredth-first manner
/// Adds the current (parent) node onto the end of the path to differentiate nodes on the same depth level.
/// </summary>
/// <param name="n">The node we are finding the path too</param>
/// <returns>the path taken from the head of the family tree to node n</returns>
public List <FTNode> SearchPath(FTNode n)
{
List <FTNode> list = new List <FTNode>();
list.Add(head);
bool found = false;
int counter = 0;
while (found != true)
{
FTNode currentNode = list[counter];
if (currentNode.children.Contains(n))
{
found = true;
list.Add(currentNode);
break;
}
for (int i = 0; i < currentNode.children.Count; i++)
{
list.Add(currentNode.children[i]);
}
counter++;
}
return(list);
}
static void solution()
{
#region TEST DATA
var mum = new FTNode();
mum.name = "mum";
var john = new FTNode();
john.name = "john";
var ron = new FTNode();
ron.name = "ron";
var ben = new FTNode();
ben.name = "ben";
var mitch = new FTNode();
mitch.name = "mitch";
var daniel = new FTNode();
daniel.name = "daniel";
var andrew = new FTNode("andrew");
var neville = new FTNode("neville");
var josh = new FTNode("josh");
var christina = new FTNode("christina");
var ellie = new FTNode("ellie");
var doug = new FTNode("doug");
// Mum Connections
mum.children.Add(john);
mum.children.Add(ron);
mum.children.Add(ben);
// John Connections
john.children.Add(mitch);
// Ron Connections
ron.children.Add(daniel);
// Ben Connections
ben.children.Add(andrew);
ben.children.Add(doug);
// Mitch Connections
mitch.children.Add(neville);
// Daniel Connections
daniel.children.Add(josh);
// Andrew Connections
andrew.children.Add(christina);
andrew.children.Add(ellie);
#endregion
var ft = new FamilyTree(mum);
ft.LowerCommonAncestor(doug, ellie);
Console.ReadLine();
}
public FamilyTree(FTNode _head)
{
this.head = _head;
}