GitHub

Construct Binary Tree from Inorder and Postorder Traversal.java

You may assume that duplicates do not exist in the tree. Know that the last element of PostOrder array is the root of the Binary tree. Find this root from the InOrder array, which will be the middle ...
GitHub

Construct Binary Tree from Inorder and Preorder Traversal.java

You may assume that duplicates do not exist in the tree. See 'Construct tree from inorder + postorder' as example. This problem uses divide and conquer idea as well. For preorder: the front node is ...
BBC

As the world inches back to a pre-WW2 order, the 'middle powers' face a grave new challenge

I had been asked to give a keynote speech at a conference at Columbia University's Journalism School. It was January 2002. Two planes had been flown into the twin towers of the World Trade Center ...