class Solution {
    public int removeElement(int[] nums, int val) {
        if (nums == null || nums.length == 0) return 0;

        int i = 0;
        for (int j = 0; j < nums.length; j++){
            if (nums[j] != val){
                nums[i++] = nums[j];
            }
        }

        return i;
    }
}