title: What is the left-child, right-sibling representation of a tree? Why would you use it?
body: <p>Many data structures store multi-way trees as binary trees using a representation called the <strong><a href="http://en.wikipedia.org/wiki/Left-child_right-sibling_binary_tree" rel="noreferrer">"left-child, right-sibling"</a></strong> representation.  What does this mean?  Why would you use it?</p>