problem0189

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189. Rotate Array

题目

Rotate an array of n elements to the right by k steps. For example, with n = 7 and k = 3, the array [1,2,3,4,5,6,7] is rotated to [5,6,7,1,2,3,4].

Note: Try to come up as many solutions as you can, there are at least 3 different ways to solve this problem.

[show hint] Hint: Could you do it in-place with O(1) extra space?

Related problem: Reverse Words in a String II

解题思路

三次翻转

1. nums 整体翻转
2. nums[:k] 翻转
3. nums[k:] 翻转