List<Integer> pos = new ArrayList<>();

        while (j-- > 0) {
            String[] purposePositions = scanner.nextLine().split(" ");
            int purposeRowPosition = Integer.parseInt(purposePositions[0]);
            int purposeColPosition = Integer.parseInt(purposePositions[1]);
            pos.add(purposeRowPosition);
            pos.add(purposeColPosition);
        }