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Count the number of duplicate elements in an array


countDuplicates([1, 1, 3, 5, 5, 5, 5, 7, 7, 11]) → 5
countDuplicates([1, 2, 3]) → 0
countDuplicates([1, 1, 1]) → 2

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public int countDuplicates(ArrayList<Integer> nums) { }

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