LetCode 27. 移除元素

static int x=[](){
    std::ios::sync_with_stdio(false);
    cin.tie(NULL);
    return 0;
}();
class Solution {
public:
    int removeElement(vector<int>& nums, int val) {
        int index = 0;
        for (int i = 0; i < nums.size(); i++){
            if (nums[i] != val){
                if (i != index)
                    nums[index] = nums[i];
                index++;
            }
        }
        return index;
    }
};