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B是m!*{n-1,m-1}？{n,k}是第二类Stirling数……

Posted by frkstyc at 2007-11-18 13:14:35
In Reply To:B是用二项式反演公式,F我觉的比较难办,二维线段树不可解 Posted by:windy7926778 at 2007-11-18 11:52:26

Followed by:

这是怎么推出来的？ (17) wywcgs 2007-11-18 13:21:17
- 我的离散书的习题……当年的作业…… (94) frkstyc 2007-11-18 13:25:03
sum{(-1)^(m-k)*c(m,k)*k*(k-1)^(n-1)} (1<=k<=m) (0) windy7926778 2007-11-18 14:20:26
- 嗯……第二类Stirling数是有个求和式展开的…… (0) frkstyc 2007-11-18 14:22:58
- 貌似我交的就是这个啊……………… (13) Mithril 2007-11-18 15:22:52

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