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Re: Replacing duplicates in a randomly generated array
I assume you have a known total number of questions.
How about you fill an array with all available question numbers. Then traverse through the array, switching the value of each position with a random position. This will randomize the array. (See a card deck shuffling program if you don't understand.) Then pick the top N of them. Sort those N if desired.
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 (since 2004)
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