New solution of problem : BinaryTreeLevelOrderTraversal2.
 Methord 1st : recursive.
 Language : C++.
 New solution of problem : BalancedBinaryTree.
 Methord 1st : recursive.
 Language : C++.
  New solution of problem : BinaryTreeInorderTraversal.
  Methord 1st : iteratively.
  Language : C++.
add new file MyNotes.txt