static int minimumSwaps(int[] arr) {
        int minimumSwaps = 0;
        for (int i = 0; i < arr.length; i++) {
            int current = arr[i];
            while(current != i + 1){
                int temp = arr[current - 1];
                arr[current - 1] = current;
                arr[i] = temp;
                ++minimumSwaps;
                current = temp;
            }
        }
        return minimumSwaps;
    }