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Remove Duplicates from an Array
Certification: Basic Level
Accuracy: 63.64%
Submissions: 11
Points: 5
Write a C# function to remove duplicates from an array of integers and return the new array.
Example 1
- Input: nums = [1, 2, 2, 3, 4, 4, 5, 5]
- Output: [1, 2, 3, 4, 5]
- Explanation:
- Step 1: Create a data structure to keep track of unique elements (e.g., HashSet).
- Step 2: Iterate through the input array [1, 2, 2, 3, 4, 4, 5, 5].
- Step 3: Add each element to the HashSet, which automatically eliminates duplicates.
- Step 4: Convert the HashSet to an array and return it.
- Step 5: The result is [1, 2, 3, 4, 5], with all duplicates removed.
Example 2
- Input: nums = [2, 2, 2, 2]
- Output: [2]
- Explanation:
- Step 1: Create a data structure to keep track of unique elements (e.g., HashSet).
- Step 2: Iterate through the input array [2, 2, 2, 2].
- Step 3: Add each element to the HashSet, which automatically eliminates duplicates.
- Step 4: Convert the HashSet to an array and return it.
- Step 5: The result is [2], as all elements in the original array were duplicates of 2.
Constraints
- 1 ≤ array length ≤ 10^4
- -10^5 ≤ array elements ≤ 10^5
- Time Complexity: O(n)
- Space Complexity: O(n)
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Solution Hints
- Use a hash set to store unique elements.
- Traverse the array and add elements to the set if they are not already present.
- Convert the set back to an array and return it.