LeetCode原文：http://articles.leetcode.com/2010/04/rotating-array-in-place.html
Rotate a one-dimensional array of n elements to the right by k steps.
For instance, with n=7 and k=3, the array {a, b, c, d, e, f, g} is rotated to {e, f, g, a, b, c, d}.
在前面的博文（ ...