public IList <int> InorderTraversal(BinaryTree.Node root)
{
List <int> result = new List <int>();
Stack <BinaryTree.Node> stack = new Stack <BinaryTree.Node>();
BinaryTree.Node currentNode = root;
while (currentNode != null || stack.Count != 0)
{
while (currentNode != null)
{
stack.Push(currentNode);
currentNode = currentNode.LeftNode;
}
if (stack.Count != 0)
{
currentNode = stack.Pop();
result.Add(currentNode.Value);
currentNode = currentNode.RightNode;
}
}
return(result);
}
public int SumOfLeftLeaves(BinaryTree.Node root)
{
if (root == null || (root.LeftNode == null && root.RightNode == null))
{
return(0);
}
int result = 0;
Queue <BinaryTree.Node> level = new Queue <BinaryTree.Node>();
BinaryTree.Node currentNode = null;
level.Enqueue(root);
while (level.Count != 0)
{
currentNode = level.Dequeue();
if (currentNode.LeftNode != null && currentNode.LeftNode.LeftNode == null && currentNode.LeftNode.RightNode == null)
{
result += currentNode.LeftNode.Value;
}
if (currentNode.LeftNode != null)
{
level.Enqueue(currentNode.LeftNode);
}
if (currentNode.RightNode != null)
{
level.Enqueue(currentNode.RightNode);
}
}
return(result);
}
public int FindBottomLeftValue(BinaryTree.Node root)
{
BinaryTree.Node mostLeftNode = null, currentNode = null;
Queue <BinaryTree.Node> level = new Queue <BinaryTree.Node>();
int currentLevelCount = 0;
level.Enqueue(root);
while (level.Count != 0)
{
currentLevelCount = level.Count;
mostLeftNode = level.Peek();
do
{
currentNode = level.Dequeue();
if (currentNode.LeftNode != null)
{
level.Enqueue(currentNode.LeftNode);
}
if (currentNode.RightNode != null)
{
level.Enqueue(currentNode.RightNode);
}
}while (--currentLevelCount > 0);
}
return(mostLeftNode.Value);
}
private int countLess(BinaryTree.Node current, System.IComparable value)
{
if (value == null)
{
throw new System.ArgumentException();
}
if (current == null)
{
return(0);
}
else if (current.left == null && current.right == null)
{
if (current.value.CompareTo(value) > 0)
{
return(1);
}
}
if (current.value.CompareTo(value) > 0)
{
return(1 + countLess(current.left, value) + countLess(current.right, value));
}
else
{
return(countLess(current.left, value) + countLess(current.right, value));
}
}
public void Flatten(BinaryTree.Node root)
{
if (root == null)
{
return;
}
BinaryTree.Node tempNode = null,
lastNode = null;
Flatten(root.LeftNode);
Flatten(root.RightNode);
if (root.LeftNode != null)
{
tempNode = root.RightNode;
root.RightNode = root.LeftNode;
root.LeftNode = null;
lastNode = root.RightNode;
while (lastNode.RightNode != null)
{
lastNode = lastNode.RightNode;
}
lastNode.RightNode = tempNode;
}
}
public string Tree2str(BinaryTree.Node t)
{
if (t == null)
{
return(string.Empty);
}
else if (t.LeftNode == null && t.RightNode == null)
{
return(t.Value.ToString());
}
StringBuilder result = new StringBuilder();
result.Append(t.Value.ToString());
if (t.RightNode != null)
{
ExtendResult(t.LeftNode, result);
ExtendResult(t.RightNode, result);
}
else if (t.LeftNode != null)
{
ExtendResult(t.LeftNode, result);
}
return(result.ToString());
}
private int countLess(BinaryTree.Node current, System.IComparable value)
{
if (current == null)
{
return(0);
}
int count = 0;
if (current.value.CompareTo(value) > 0)
{
count++;
}
if (current.right == null && current.left == null)
{
count += 0;
}
if (current.right != null)
{
count += countLess(current.right, value);
}
if (current.left != null)
{
count += countLess(current.left, value);
}
countLess(current.left, value);
countLess(current.right, value);
return(count);
}
public virtual int countLessThan(BinaryTree.Node current, System.IComparable value
)
{
int count = 0;
if (value == null)
{
throw new System.ArgumentException();
}
if (current == null)
{
return(0);
}
if (current.left == null && current.right == null)
{
if (current.value.CompareTo(value) > 0)
{
return(1);
}
else
{
return(0);
}
}
if (current.value.CompareTo(value) > 0)
{
count = 1;
}
return(count + countLessThan(current.left, value) + countLessThan(current.right,
value));
}
public static void EntryPoint()
{
BinaryTree.Node root = new BinaryTree.Node(1);
BinaryTree.Node node1 = new BinaryTree.Node(2);
root.LeftNode = node1;
(new Question156()).UpsideDownBinaryTree(root);
}
public IList <IList <int> > FindLeaves(BinaryTree.Node root)
{
IList <IList <int> > levels = new List <IList <int> >();
Add(root, levels);
return(levels);
}
public int MaxDepth(BinaryTree.Node root)
{
if (root == null)
{
return(0);
}
return(Math.Max(MaxDepth(root.LeftNode), MaxDepth(root.RightNode)) + 1);
}
public int GetDepth(BinaryTree.Node node)
{
if (node == null)
{
return(0);
}
return(Math.Max(GetDepth(node.LeftNode) + 1, GetDepth(node.RightNode) + 1));
}
public IList <string> BinaryTreePaths(BinaryTree.Node root)
{
List <string> result = new List <string>();
if (root != null)
{
ExtendPath(root, string.Empty, result);
}
return(result);
}
public bool IsSymmetric(BinaryTree.Node root)
{
if (root == null || (root.LeftNode == null && root.RightNode == null))
{
return(true);
}
else
{
return(CheckSymmetric(root.LeftNode, root.RightNode));
}
}
private BinaryTree.Node ReadNode(BitStream bs, BinaryTree.Node root)
{
var n = root;
while (!n.HasValue)
{
n = n.GetNext(bs.ReadBit());
}
return(n);
}
private static BinaryTree.Node <int> SeedNode(BinaryTree binaryTree)
{
BinaryTree.Node <int> root = null;
var numbers = new[] { 3, 5, 1, 8, 2, 4, 6, 9, 7 };
foreach (var number in numbers)
{
root = binaryTree.Insert(root, number);
}
return(root);
}
private int countmethod(BinaryTree.Node node, System.IComparable input)
{
if (node == null)
{
return(0);
}
if (input.CompareTo(node.value) < 0)
{
return(1 + countmethod(node.right, input) + countmethod(node.left, input));
}
return(0 + countmethod(node.right, input) + countmethod(node.left, input));
}
private int count(BinaryTree.Node current, object value)
{
if (current == null)
{
return(0);
}
if (current.value.CompareTo(value) > 0)
{
return(1 + count(current.left, value) + count(current.right, value));
}
return(count(current.left, value) + count(current.right, value));
}
private int helper(BinaryTree.Node current, System.IComparable val)
{
if (current == null)
{
return(0);
}
if (current.value.CompareTo(val) > 0)
{
return(helper(current.left, val) + helper(current.right, val) + 1);
}
return(helper(current.left, val) + helper(current.right, val));
}
private int h(System.IComparable value, BinaryTree.Node n)
{
if (n == null)
{
return(0);
}
if (value.CompareTo(n.value) < 0)
{
return(1 + h(value, n.left) + h(value, n.right));
}
return(h(value, n.left) + h(value, n.right));
}
private int countLessThan(System.IComparable a, BinaryTree.Node current)
{
if (current == null)
{
return(0);
}
if (current.value.CompareTo(a) <= 0)
{
return(countLessThan(a, current.left) + countLessThan(a, current.right));
}
return(countLessThan(a, current.left) + countLessThan(a, current.right) + 1);
}
private int countLessThan(System.IComparable value, BinaryTree.Node a)
{
if (a == null)
{
return(0);
}
if ((value).CompareTo(a.value) < 0)
{
return(1 + countLessThan(value, a.left) + countLessThan(value, a.right));
}
return(0 + countLessThan(value, a.left) + countLessThan(value, a.right));
}
private int countHelp(BinaryTree.Node current, System.IComparable value)
{
if (current == null)
{
return(0);
}
if (current.value.CompareTo(value) > 0)
{
return(1 + countHelp(current.left, value) + countHelp(current.right, value));
}
return(countHelp(current.left, value) + countHelp(current.right, value));
}
private int less(BinaryTree.Node current, System.IComparable val)
{
if (current == null)
{
return(0);
}
if ((current.value).CompareTo(val) > 0)
{
return(1 + less(current.left, val) + less(current.right, val));
}
return(less(current.left, val) + less(current.right, val));
}
public virtual int count(BinaryTree.Node current, System.IComparable value)
{
if (current == null)
{
return(0);
}
if (current.value.CompareTo(value) > 0)
{
return(count(current.left, value) + count(current.right, value) + 1);
}
return(count(current.left, value) + count(current.right, value));
}
public static void EntryPoint()
{
BinaryTree.Node Node1 = new BinaryTree.Node(3);
BinaryTree.Node Node2 = new BinaryTree.Node(9);
BinaryTree.Node Node3 = new BinaryTree.Node(20);
Node1.LeftNode = Node2;
Node1.RightNode = Node3;
BinaryTree.Node Node4 = new BinaryTree.Node(15);
BinaryTree.Node Node5 = new BinaryTree.Node(7);
Node2.LeftNode = Node4;
Node2.RightNode = Node5;
(new Question102()).LevelOrder(Node1);
}
public bool HasPathSum(BinaryTree.Node root, int sum)
{
if (root == null || (root.RightNode == null && root.LeftNode == null && root.Value != sum))
{
return(false);
}
else if (root.RightNode == null && root.LeftNode == null && root.Value == sum)
{
return(true);
}
return(HasPathSum(root.RightNode, sum - root.Value) || HasPathSum(root.LeftNode, sum - root.Value));
}
public virtual int countLessThan(System.IComparable value, BinaryTree.Node current
)
{
if (current == null)
{
return(0);
}
if (current.value.CompareTo(value) > 0)
{
return(1 + countLessThan(value, current.left) + countLessThan(value, current.right
));
}
return(countLessThan(value, current.left) + countLessThan(value, current.right));
}
private int helper(BinaryTree.Node current, System.IComparable value)
{
if (current == null)
{
return(0);
}
int count = 0;
if (value.CompareTo(current.value) < 0)
{
count = 1;
}
return(count + helper(current.right, value) + helper(current.left, value));
}
private int countLessThan(BinaryTree.Node c, System.IComparable value)
{
if (c == null)
{
return(0);
}
int count = 0;
if (c.value.CompareTo(value) > 0)
{
count = 1;
}
return(count + countLessThan(c.left, value) + countLessThan(c.right, value));
}