Leetcode80. 删除有序数组中的重复项 II

题目传送地址：​​https://leetcode.cn/problems/remove-duplicates-from-sorted-array-ii/​​

运行效率

代码如下：

class Solution {
     public static int removeDuplicates(int[] nums) {
        int left = 0;
        int right = 1;
        int count=0;
        //注意：nums的长度是动态变化的，所以下面的while条件里要写成小于  nums.length-count
        while (right < nums.length-count && left < nums.length-count) {
            if (nums[left] == nums[right]) {
                if (right - left == 2) {
                    moveForward(nums, right);
                    count++;
                } else {
                    right++;
                }
                continue;
            }
            if (nums[left] != nums[right]) {
                left = right;
                right++;
            }
        }
        return nums.length-count;
    }
    
    public static void moveForward(int[] nums, int index) {
        for (int i = index; i < nums.length; i++) {
            nums[i - 1] = nums[i];
        }
    }
}