Sep 12, 2014

### Binary Tree Operations(III) - Convert a Binary Tree to Down-Right Representation

*This is the third article on binary tree operations. For other topics on binary tree, please refer to:*

Aug 16, 2014

### Binary Tree Operations(II) - Path Sum and Cycle Detection

This is the second article on binary tree operations. For other topics on binary tree, please refer to

Aug 3, 2014

### String Permutation

The *string permutation* problem aims to find all the *permutations* of a string(re-arrangement of characters in this string). A string of length `n`

has `n!`

permutations.