Given an array of size N in which every number is between 1
and N, determine if there are any duplicates in it. You are
allowed to destroy the array if you like.

Answer Posted / foobar

You can use a hashtable, populate the keys from 1 to n.

while you re reading, mark the number you read and increment
their values by 1. if if you see the same number again,
fail. that s a dup. runs in O(n).

or you can use bucket sort.

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