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27. Remove Element 👎

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

    for (const int num : nums)
      if (num != val)
        nums[i++] = num;

    return i;
  }
};

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class Solution {
  public int removeElement(int[] nums, int val) {
    int i = 0;

    for (final int num : nums)
      if (num != val)
        nums[i++] = num;

    return i;
  }
}

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class Solution:
  def removeElement(self, nums: List[int], val: int) -> int:
    i = 0

    for num in nums:
      if num != val:
        nums[i] = num
        i += 1

    return i