27. Remove Element C++

双指针（广义）

class Solution {
public:
    int removeElement(vector<int>& nums, int val) {
        int count = 0;
        int siz = nums.size();
        for (int i = 0; i < siz; i++) {
            if (nums[i] != val) {
                nums[count++] = nums[i];
            }
        }
        return count;
    }
};