static int minimumAbsoluteDifference(int[] arr) {
        int n = arr.Length;

        Array.Sort(arr);

        int minAbsDiff = Math.Abs(arr[0] - arr[1]);

        for(int i = 1; i < n - 1; i++){
            int tempDiff = Math.Abs(arr[i] - arr[i + 1]);
            if(tempDiff < minAbsDiff)
                minAbsDiff = tempDiff;
        }
        return minAbsDiff;
    }