080. Remove Duplicates from Sorted Array II

 1 class Solution {
 2 public:
 3     int removeDuplicates(vector<int>& nums) {
 4         if (nums.size() < 3) return nums.size();
 5         else {
 6             int i = 2, j = 1;
 7             while (i < nums.size()) {
 8                 if (nums[i] != nums[j - 1]) {
 9                     nums[++j] = nums[i];
10                 }
11                 ++i;
12             }
13             return j + 1;
14         }
15     }
16 };