Java_15657.java

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;

public class Java_15657 {
    static StringBuilder sb = new StringBuilder();
    static int N, M;
    static int[] nums;
    static int[] orders;

    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());
        N = Integer.parseInt(st.nextToken());
        M = Integer.parseInt(st.nextToken());
        nums = new int[N];
        orders = new int[M];
        st = new StringTokenizer(br.readLine());
        for (int i = 0; i < N; i++) {
            nums[i] = Integer.parseInt(st.nextToken());
        }
        Arrays.sort(nums);
        perm(0);
        System.out.print(sb);
    }

    static void perm(int idx) {
        if (idx == M) {
            for (int a : orders) {
                sb.append(a).append(" ");
            }
            sb.deleteCharAt(sb.length() - 1);
            sb.append("\n");
            return;
        }
        for (int i = 0; i < N; i++) {
            if (idx == 0 || orders[idx - 1] <= nums[i]) {
                orders[idx] = nums[i];
                perm(idx + 1);
            }
        }
    }
}