/*

Author: Jiangong SUN

*/

Here I will introduce the breadth first traversal of binary tree.

The principe is that you traverse the binary tree level by level.

This traversal is quite different than depth first traversal. In depth first traversal you can use recursive method to traverse.

Here is one solution using a queue.

        /// <summary>

        /// breadth-first traversal 宽度遍历树

        /// </summary>

        /// <typeparam name="T"></typeparam>

        /// <param name="node"></param>

        public void Traversal<T>(Node<T> node)

        {

            //create a Node<T> queue

            var treeQueue = new Queue<Node<T>>();

            //initialize queue with tree root node

            treeQueue.Enqueue(node);

            //if queue has elements

            while (treeQueue.Count > 0)

            {

                //dequeue the queue's first node

                Node<T> current = treeQueue.Dequeue();

                //print the node name

                PrintNodeName(current);

                //if node has Left leaf, enqueue it

                if (current.LNode != null)

                    treeQueue.Enqueue(current.LNode);

                //if node has right leaf, enqueue it

                if (current.RNode != null)

                    treeQueue.Enqueue(current.RNode);

            }

        }

references;

http://www.cs.bu.edu/teaching/c/tree/breadth-first/

http://hectorea.com/blog/programming-interview-31-binarytree-traversal-by-levels-breadth-first/#