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Unfortunately, the "Collections.sort" method degrades the performance to O(n*log(n)). Besides, the "List" collection uses an additional O(n) amount of memory. An optiomal solution should run in O(n*log(k)) time and use O(k) space.
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Unfortunately, the "Collections.sort" method degrades the performance to O(n*log(n)). Besides, the "List" collection uses an additional O(n) amount of memory. An optiomal solution should run in O(n*log(k)) time and use O(k) space.