Problem 1004 保证k不会超过之后排列的总个数吗?

504441036 | 2014-10-05 19:59:55Author
rt
admin | 2014-10-05 20:00:31# 1
RE:保证k不会超过之后排列的总个数吗?
please read the problem carefully
504441036 | 2014-10-05 20:02:04# 2
RE:保证k不会超过之后排列的总个数吗?
soga thx