vector<int> closestNumbers(vector<int> arr) {
    vector<int>result;
    // minimun difference
    int mini=INT_MAX;
    sort(arr.begin(),arr.end());
    for(int i=0;i<arr.size()-1;i++){
        
        int absDiff=abs(arr[i]-arr[i+1]);
        if(absDiff<mini){
            mini=absDiff;
            result.erase(result.begin(),result.end());
            result.push_back(arr[i]);
            result.push_back(arr[i+1]);
        }
        else if(absDiff==mini){
             result.push_back(arr[i]);
            result.push_back(arr[i+1]);
        }
    }
    return result;
    
}