황소개발자

n, m = map(int, input().split()) num_list = list(map(int, input().split())) num_list.sort() a = [0 for i in range(m)] c = [False for i in range(n)] def go(selected, n, m): if selected == m: print(' '.join(map(str, a))) return for i in range(n): if c[i] == False: c[i] = True a[selected] = num_list[i] go(selected + 1, n, m) c[i] = False # a[selected] = num_list[idx] # go(idx + 1, selected + 1, n, ..