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Vicinissimi
Data una lista di numeri, restituire una nuova lista coi primi tre numeri più vicini allo zero, ordinati dal più vicino al più lontano

vicinissimi([1, 10, 15]) → [1, 10, 15]
vicinissimi([15, 1, 10, 20]) → [1, 10, 15]
vicinissimi([15, -1, 1, 16]) → [-1, 1, 15]
...Save, Compile, Run (ctrl-enter)
public List<Integer> vicinissimi(List<Integer> nums) { }

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