public static Tree<int> GenerateTreeFtomTreeNodes(TreeNode<int>[] nodeArray)
{
bool[] isChild = new bool[nodeArray.Length];
foreach (var node in nodeArray)
{
if (node != null)
{
foreach (var child in node)
{
isChild[child.Value] = true;
}
}
}
for (int i = 0; i < isChild.Length; i++)
{
if (!isChild[i])
{
Tree<int> tree = new Tree<int>(i);
GenerateTreeFromFoor(tree, nodeArray);
return tree;
}
}
throw new ArgumentException("No root!!!");
}
private static TreeNode<int>[] GetNodesFtomConsole()
{
int nodeCount = 0;
bool isAValidNumber = int.TryParse(Console.ReadLine(), out nodeCount);
if (!isAValidNumber || nodeCount < 0)
{
throw new ArgumentException("You have to enter a valid positive integer for number of nodes!");
}
TreeNode<int>[] nodes = new TreeNode<int>[nodeCount];
for (int i = 0; i < nodeCount; i++)
{
nodes[i] = new TreeNode<int>(i);
}
for (int i = 1; i <= nodeCount - 1; i++)
{
var pair = ReadPareFromConsole();
int parentId = pair.Item1;
int childId = pair.Item2;
nodes[parentId].AddChild(new TreeNode<int>(childId));
}
return nodes;
}
private static void GenerateTreeFromFoor(Tree<int> tree, TreeNode<int>[] nodeArray)
{
foreach (TreeNode<int> node in nodeArray[tree.Root.Value])
{
tree.Root.AddChild(node);
GenerateSubnodes(node, nodeArray);
}
}
private static void GenerateSubnodes(TreeNode<int> node, TreeNode<int>[] nodeArray)
{
foreach (TreeNode<int> subnode in nodeArray[node.Value])
{
node.AddChild(subnode);
GenerateSubnodes(subnode, nodeArray);
}
}