My solution, it is not Dct.

jinjing · 2011-08-04 18:07:45Z

My solution, it is not Dct.简介

来源: jinjing 于 2011-08-04 18:07:45 [档案] [旧帖] [给我悄悄话] 本文已被阅读：次 (226 bytes)

回答: 唉，怎么说呢。N=3，见内。由 wxcfan123 于 2011-08-04 14:09:00

Induction,...there are1,2,3,...k.fk=(2k-1)!!,let me see n=k+1,

2,3,...k+1,there are n=k,we have fk=(2k-1)!!,How about 1,2,3,...k+1,1 can near any i,put L or R,plus the first L,there are 2k+1,so we have (2k+1)!!.

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