public class Combination {

    public static void combine(int[] list, int k, int l, int r, int n) {

        if (k + l > n + 1)

            return;

        if (l == 0) {

            for (int i = 0; i < r; i++)

                System.out.print(list[i] + " ");

            System.out.println();

            return;

        }

        list[r - l] = k;

        combine(list, k + 1, l - 1, r, n);

        if (k + l <= n)

            combine(list, k + 1, l, r, n);

    }

    public static void main(String[] args) throws NumberFormatException{

        int n = 5;

        int r = 3;

        int[] list = new int[r];

        int k = 1;

        int l = r;

        Combination.combine(list, k, l, r, n);

    }

}