80.txt

class Solution {
public:
    int removeDuplicates(vector<int>& nums) {
        int n= nums.size();
        if (n<=2) return n;

        int slow=2;
        for(int fast=2;fast<nums.size();fast++){
            if(nums[fast]!=nums[slow-2]){
               
                nums[slow]=nums[fast];
                 slow++;
               
                
                
                S
                
                
                
            }
            
            
            
        }
        return slow;
        
    }
};