All Unique Permutations of an array.cpp

class Solution {
  public:
    vector<vector<int>> uniquePerms(vector<int> &arr ,int n) {
        // code here
        //using next perm
        
        sort(arr.begin(), arr.end());
        vector<vector<int>>ans;
        do{
            ans.push_back(arr);
        }while(next_permutation(arr.begin(), arr.end()));
        
        return ans;
    }
};