//Time: O(n) & Space: O(1) (modifies tree and reverts back)
public static void inorderMorris(BST tree)
{
Console.WriteLine("Inorder Morris traversal (threaded binary tree): ");
Node node = tree.root;
while (node != null)
{
if (node.left == null)
{
Console.Write(" {0} ", node.data);
node = node.right;
}
else
{
Node succ = node.left;
while (succ.right != null && succ.right != node)
succ = succ.right;
if (succ.right == null)
{
succ.right = node;
node = node.left;
}
else if (succ.right == node)
{
succ.right = null;
Console.Write(" {0} ", node.data);
node = node.right;
}
}
}
Console.WriteLine();
}
//Time: O(n) & Space: O(1)
public static void inorderIter(BST tree)
{
Stack<Node> stk = new Stack<Node>();
Node node = tree.root;
bool done = false;
Console.WriteLine("Inorder traversal Iterative Using Stack");
while (!done)
{
if (node != null)
{
stk.Push(node);
node = node.left;
}
else
{
if (stk.Count > 0)
{
node = stk.Pop();
Console.Write(" {0} ", node.data);
node = node.right;
}
else
done = true;
}
}
Console.WriteLine();
}
public static void driver()
{
BST tree = new BST();
tree.buildTree();
BST mirror = new BST();
mirror.buildTree();
mirror.ConvertToMirror(mirror.root);
Traversals.levelorder(mirror);
Traversals.levelorder(tree);
Console.WriteLine("Ismirror = {0}", mirror.IsMirror(mirror.root, tree.root));
//Traversals.driver(tree);
}
public static void driver()
{
int[] inorder = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
int[] preorder = { 5, 4, 2, 1, 3, 6, 8, 7, 9, 10 };
Node root = InorderAndPreorderToTree(preorder, inorder, 0, inorder.Length - 1);
BST tree = new BST();
tree.root = root;
Traversals.levelorder(tree);
Traversals.inorderIter(tree);
Traversals.preorderIter(tree);
}
static void Main(string[] args)
{
BST tree = new BST();
tree.insert(50);
tree.insert(2);
tree.insert(7);
tree.insert(94);
tree.insert(24);
tree.insert(24);
tree.insert(71);
tree.insert(30);
tree.insert(49);
//Console.WriteLine("Count: " + tree.count()); // Should be 9
//Console.WriteLine("Min: " + tree.min()); // Should be 2
//Console.WriteLine("Max: " + tree.max()); // Should be 94
//Console.WriteLine("Depth: " + tree.depth()); // Should be 7
tree.prettyprint(); // Prints the values in order
Console.WriteLine();
tree.delete(50);
tree.prettyprint(); // Prints the values in order
Console.WriteLine();
tree.printInRange(5,80);
Console.ReadLine();
/*tree.delete(49); // test for value not in tree
tree.delete(51); // test for value not in tree
tree.delete(50);
tree.delete(2);
tree.delete(7);
tree.delete(94);
tree.delete(24);
tree.delete(24);
tree.delete(71);
tree.delete(30);
tree.delete(49);*/
//Console.WriteLine("Count: " + tree.count()); // Should be 0
//Console.WriteLine("Min: " + tree.min()); // Should be -1
//Console.WriteLine("Max: " + tree.max()); // Should be -1
//Console.WriteLine("Depth: " + tree.depth()); // Should be 0
//tree.prettyprint(); // Prints the values in order
}
public static void driver(BST tree)
{
levelorder(tree);
inorderIter(tree);
Console.WriteLine("Inorder traversal recursive : ");
inorderRecur(tree.root);
Console.WriteLine();
inorderMorris(tree);
preorderIter(tree);
Console.WriteLine("Inorder traversal recursive : ");
preorderRecur(tree.root);
Console.WriteLine();
preorderMorris(tree);
postorderIter(tree);
Console.WriteLine("Inorder traversal recursive : ");
postorderRecur(tree.root);
Console.WriteLine();
}
//Time: O(n) & Space: O(1)
public static void preorderMorris(BST tree)
{
Node node = tree.root;
while (node != null)
{
if (node.left == null)
{
Console.Write(" {0} ", node.data);
node = node.right;
}
else
{
Node succ = node.left;
while (succ.right != null && succ.right != node)
succ = succ.right;
if (succ.right == null)
{
succ.right = node;
Console.Write(" {0} ", node.data);
node = node.left;
}
else if (succ.right == node)
{
succ.right = null;
node = node.right;
}
}
}
Console.WriteLine();
}
//Time: O(n) & Space: O(n)
public static void preorderIter(BST tree)
{
Node node = tree.root;
if (node == null)
return;
Console.WriteLine("Preorder Iterative traversal: ");
Stack<Node> stk = new Stack<Node>();
stk.Push(node);
while(stk.Count > 0)
{
node = stk.Pop();
Console.Write(" {0} ", node.data);
if (node.right != null)
stk.Push(node.right);
if (node.left != null)
stk.Push(node.left);
}
Console.WriteLine();
}
//Time: O(n) & Space: O(2n) (two stacks
public static void postorderIter(BST tree)
{
Node node = tree.root;
if (node == null)
return;
Console.WriteLine("Post order traversal Iter using two stacks: ");
Stack<Node> stk = new Stack<Node>();
Stack<Node> res = new Stack<Node>();
stk.Push(node);
while (stk.Count > 0)
{
node = stk.Pop();
res.Push(node);
if (node.left != null)
stk.Push(node.left);
if (node.right != null)
stk.Push(node.right);
}
while (res.Count > 0)
{
node = res.Pop();
Console.Write(" {0} ", node.data);
}
Console.WriteLine();
}
//print per line: O(n)
public static void levelorder(BST tree)
{
if (tree.root == null)
return;
Node node = tree.root;
Queue<Node> queue = new Queue<Node>();
queue.Enqueue(node);
int nextlevel = 1;
int numnodes;
Console.WriteLine("Level order traversal (print per line)");
while (queue.Count > 0)
{
numnodes = nextlevel;
nextlevel = 0;
for (int i = 0; i < numnodes; i++)
{
node = queue.Dequeue();
Console.Write(" {0} ", node.data);
if (node.left != null)
{
queue.Enqueue(node.left);
nextlevel++;
}
if (node.right != null)
{
queue.Enqueue(node.right);
nextlevel++;
}
}
Console.WriteLine();
}
}