旋转字符串

一:问题描述: 编程珠玑第二章的第二个问题是字符串(或者理解为向量)旋转问题,具体描述如下: rotate a one-dimensional vector of n elements left by i positions. eg: with n = 8; i = 3, the vector abcdefgh is rotated to defghabc. 这个问题在编程之美中也出现了,问题描述
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