static auto fast_io = []

{

    ios::sync_with_stdio(false);

	cout.tie(nullptr);

	cin.tie(nullptr);

	return 0;

}();

class Solution {

public:

    int removeElement(vector<int>& nums, int val)

    {

        if (!nums.size()) return 0;

        int i = -1;

        for (int j = 0; j < nums.size(); ++j)

            if (nums[j] != val)

                nums[++i] = nums[j];

        return i + 1;

    }

};