- def perm(n,m,current,lists=[]):
- if m == len(lists):
- print ' '.join( map(str,lists))
- return 1
- sum = 0
- for i in range(current,n+1):
- if i not in lists:
- sum+=perm(n,m,i+1,lists+[i])
- return sum
- n,m = [int(i) for i in raw_input().split()]
- print perm(n,m,1)
- #该片段来自于http://www.codesnippet.cn/detail/080120131428.html
来源: http://www.codesnippet.cn/detail/080120131428.html