leetcode 27. 移除元素 easy ​

双指针

//
class Solution {
public:
    int removeElement(vector& nums, int val) {

        int pre = -1;
        for (int i = 0; i < nums.size(); i++){
            if (nums[i] != val)
                nums[++pre] = nums[i];
        }

        return pre+1;
    }
};