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80. Remove Duplicates from Sorted Array II 👍

  • Time: $O(n)$
  • Space: $O(1)$
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class Solution {
 public:
  int removeDuplicates(vector<int>& nums) {
    int i = 0;

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

    return i;
  }
};

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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;
  }
}

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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