移除元素

public class Solution
{
    public int RemoveElement(int[] nums, int val)
    {
        int arrLength = nums.Length;
        int left = 0;
        for (var right = 0; right < arrLength; right++)
        {
            if (nums[right] != val)
            {
                nums[left] = nums[right];
                left++;
            }
        }
        return left;
    }
}