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26. Remove Duplicates from Sorted Array 👎

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

    for (const int num : nums)
      if (i < 1 || num > nums[i - 1])
        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 < 1 || num > nums[i - 1])
        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 < 1 or num > nums[i - 1]:
        nums[i] = num
        i += 1

    return i

var removeDuplicates = function(nums) {
  if (!nums.length) return 0;
  let k = 1;
  for (let i = 1; i < nums.length; i++) {
    if (nums[i] !== nums[k - 1]) { nums[k] = nums[i]; k++; }
  }
  return k;
};
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