Eric Walker added Radix tree - Wikipedia to Trie (data structure)

Eric Walker added Log-structured merge-tree (LSM tree), Trie (data structure) and Hash array mapped trie and a number of links to Tree (data structure), and added Tree (data structure) to Algorithms and data structures

Eric Walker added Radix tree - Wikipedia to Trie (data structure), and added Trie (data structure) to Tree (data structure)