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I think Trie Data Structure should work here.
- dsshah22 April 21, 2014Source : Wikipedia
Insert
=======
algorithm insert(root : node, s : string, value : any):
node = root
i = 0
n = length(s)
while i < n:
if node.child(s[i]) != nil:
node = node.child(s[i])
i = i + 1
else:
break
(* append new nodes, if necessary *)
while i < n:
node.child(s[i]) = new node
node = node.child(s[i])
i = i + 1
node.value = value
Output all keys in the trie by means of pre-order traversal, which results in output that is in lexicographically increasing order