回复：解释：|OOO|OOOOOOOOOO|O||OOOOO|.....|OOO|||O|OOOOOOOOO|O|
jinjing
2010-06-17 08:30:56
( reads)
m people and n rooms also right,C(m+n-1,n).
m people and n rooms also right,C(m+n-1,n).
皆兄弟也
2010-06-17 10:00:40m people and n rooms: C(m+n-1,m), instead of C(m+n-1,n).