有點問題吧

本帖於 2009-07-28 16:38:03 時間, 由普通用戶 康MM 編輯
回答: IMO 2009康MM2009-07-24 03:51:50

The statement "Given a point p between 0 and s = a_1+a_2+...a_n, it
has at most (n-1)! ways to reach." looks suspicious. Think about 1,2,3. There are 4 sequences that reaches 3 ([1,2,3],[2,1,3],[3,1,2],[3,2,1]) and 4 > 2!

所有跟帖: 

回複:有點問題吧 -botong- 給 botong 發送悄悄話 botong 的博客首頁 (209 bytes) () 07/27/2009 postreply 11:01:10

回複:回複:有點問題吧 -dynamic- 給 dynamic 發送悄悄話 (79 bytes) () 07/27/2009 postreply 18:12:36

回複:回複:回複:有點問題吧 -botong- 給 botong 發送悄悄話 botong 的博客首頁 (91 bytes) () 07/28/2009 postreply 10:22:54

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