WHAT_IS_O(N)

//given : generate N unique integers, return array
// N - any positive int 32

public int [] randomize(int n){
    Set<Integer> memo  = new HashSet<>();
    int [] result = new int[n];
    for(int i = 0; i < n; i++){
    int candidate = ThreadLocalRandom.current().nextInt(Integer.MIN_VALUE, Integer.MAX_VALUE); // random int 32 from java library
    while(memo.contains(candidate)){
        candidate = ThreadLocalRandom.current().nextInt(Integer.MIN_VALUE, Integer.MAX_VALUE); //
    }
    memo.add(candidate);
    reuslt[i] = candidate;
}

return result;

}