public static List<int> icecreamParlor(int m, List<int> arr)
    {   
        List<int> returnA = new List<int>();

        for (int i = 0; i < arr.Count; i++){
            
            for (int j = 0; j < arr.Count; j++){
                
                if (arr[i] + arr[j] == m && i != j){
                    returnA = [(i + 1), (j + 1)];
                    returnA.Sort();
                    break;
                }
            }
        
        }
        
        return returnA;
        
    }