X-fast trie data structure

X-fast trie is a data structure used to store integers from a bounded domain. It is a bitwise trie, i.e. a binary tree where each subtree stores values having binary representations with common prefix. X-fast trie provides access to a sorted tree that treats integers as if they were words of w bits, which allows storing integers as a trie of words. Its advantage is that operations can be performed in constant time depending on the size of the universe, not the number of items in trie.

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