Tuesday, June 19, 2007

digital-search tree,trie,radix tree

DST is not a common term. Could be related to the more common radix-tree and "trie"

The sort order is the English dictionary sort order. I think it's also the common string sort order

nearly optimal performance with low implementation effort

designed for string (ie alphanumeric) keys. Simplest example could be decimal integers

At insert time (or tree-build time), each digit (or character) of the key is used at the next branching node to decide to move left or right.

first digit is used to compare with the root node's first digit? 2nd digit is used to compare with the 2nd digit of the 2nd generation branching node?

Unlike binary search tree, nodes on my left are not always smaller, but why?

comparable insert/search performance to read-black tree, but with an implementation as easy as binary search tree.

slow sort

Digit can also be a bit, but still different from a binary search tree. You may need a reasonable understanding of binary search tree first.

BST requires key-comparison at each branching node; DST uses only digit-comparison?

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