算法之美――循环移位(XY→YX)逆操作 - 小熊不去实验室 - 博客频道 - CSDN.NET



题目要求:

将字符串str进行循环移位,要求算法空间复杂度O(1),时间复杂度O(n)

思路:

假设str需要循环移位k位,则将其分为前后两部分,分别长k和n-k,称AB

则循环移位的过程即为XY->YX. 可由XT即转置完成,(XTYT)T=(YT)T(XT)T=YX

abcdefgh→(abcd)(efgh)→(dcba)(hgfe)→(dcbahgfe)→(efghabcd)


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