Need a program for dictionary which works on Complexity of O(1)

Question

Dictionary with least complexity

Answer 1

real time? thats almost impossible.....
you could read in a file
words.txt
got em all
then hash all the words that start with a into a linked list.
so hash fun would be word[0] % 26.
then when searching for the word. you begin at that letter instead of the beginning of the alphabet. but for it to be O (1) you would have ro hash every word individually with a unique key. then just recall that key.