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Hello Programmers/Coders, Today we are going to share solutions to the Programming problems of LeetCode Solutions in C++, Java, & Python. At Each Problem with Successful submission with all Test Cases Passed, you will get a score or marks and LeetCode Coins. And after solving maximum problems, you will be getting stars. This will highlight your profile to the recruiters.

In this post, you will find the solution for the Remove Duplicates from Sorted Array II in C++, Java & Python-LeetCode problem. We are providing the correct and tested solutions to coding problems present on LeetCode. If you are not able to solve any problem, then you can take help from our Blog/website.

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Link for the ProblemRemove Duplicates from Sorted Array II– LeetCode Problem

Remove Duplicates from Sorted Array II– LeetCode Problem

Problem:

Given an integer array nums sorted in non-decreasing order, remove some duplicates in-place such that each unique element appears at most twice. The relative order of the elements should be kept the same.

Since it is impossible to change the length of the array in some languages, you must instead have the result be placed in the first part of the array nums. More formally, if there are k elements after removing the duplicates, then the first k elements of nums should hold the final result. It does not matter what you leave beyond the first k elements.

Return k after placing the final result in the first k slots of nums.

Do not allocate extra space for another array. You must do this by modifying the input array in-place with O(1) extra memory.

Custom Judge:

The judge will test your solution with the following code:

int[] nums = [...]; // Input array
int[] expectedNums = [...]; // The expected answer with correct length

int k = removeDuplicates(nums); // Calls your implementation

assert k == expectedNums.length;
for (int i = 0; i < k; i++) {
    assert nums[i] == expectedNums[i];
}

If all assertions pass, then your solution will be accepted.

Example 1:

Input: nums = [1,1,1,2,2,3]
Output: 5, nums = [1,1,2,2,3,_]
Explanation: Your function should return k = 5, with the first five elements of nums being 1, 1, 2, 2 and 3 respectively.
It does not matter what you leave beyond the returned k (hence they are underscores).

Example 2:

Input: nums = [0,0,1,1,1,1,2,3,3]
Output: 7, nums = [0,0,1,1,2,3,3,_,_]
Explanation: Your function should return k = 7, with the first seven elements of nums being 0, 0, 1, 1, 2, 3 and 3 respectively.
It does not matter what you leave beyond the returned k (hence they are underscores).

Constraints:

  • 1 <= nums.length <= 3 * 104
  • -104 <= nums[i] <= 104
  • nums is sorted in non-decreasing order.
Remove Duplicates from Sorted Array II – LeetCode Solutions
Remove Duplicates from Sorted Array II in C++:
class Solution {
 public:
  int removeDuplicates(vector& nums) {
    int i = 0;

    for (const int num : nums)
      if (i < 2 || num > nums[i - 2])
        nums[i++] = num;

    return i;
  }
};
Remove Duplicates from Sorted Array II in Java:
class Solution {
  public int removeDuplicates(int[] nums) {
    int i = 0;

    for (final int num : nums)
      if (i < 2 || num > nums[i - 2])
        nums[i++] = num;

    return i;
  }
}
Remove Duplicates from Sorted Array II in Python:
class Solution:
  def removeDuplicates(self, nums: List[int]) -> int:
    i = 0

    for num in nums:
      if i < 2 or num != nums[i - 2]:
        nums[i] = num
        i += 1

    return i

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