leetcode-Remove Duplicates from Sorted Array II-80

 1 class Solution {
 2 public:
 3     int removeDuplicates(vector<int>& nums) {
 4         int ans=0;
 5         if(nums.size()==0) return ans;
 6         int cur=nums[0];
 7         int cnt=1;
 8         ans=1;
 9         for(int i=1;i<nums.size();i++){
10             if(nums[i]==cur){
11                 cnt++;
12                 if(cnt<=2) nums[ans++]=nums[i];
13             }
14             else{
15                 cur=nums[i];
16                 cnt=1;
17                 nums[ans++]=nums[i];
18             }
19         }
20         return ans;
21     } 
22 };