removing duplicates element in an array

class Solution {
public:
    int removeDuplicates(vector<int>& nums) {
        vector<int>ans;
        int n=nums.size();
       sort(nums.begin(),nums.end());
          for(int i=0;i<n;i++)
    {
        for(int j=i+1;j<n;j++)
        {
            if(nums[i]==nums[j])
            {
                nums[i]=nums[j]=-1;
            }

        }
    }
    for(int i=0;i<n;i++)
    {
        if(nums[i]<0)
        ans.push_back(nums[i]);
    }
    
}`
return nums ; `

};

` i am not getting the ouput,it is showing this

error: expected member name or ';' after declaration specifiers return nums ; ^