189. Rotate Array

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]

Related problem: Reverse Words in a String II

Credits:
Special thanks to @Freezen for adding this problem and creating all test cases.

Subscribe to see which companies asked this question

public class Solution {
        public void reverse(int[] nums,int i,int j){
　　　　while (i < j) {
　　　　　　nums[i] ^= nums[j];
　　　　　　nums[j] = nums[i] ^ nums[j];
　　　　　　nums[i] = nums[i] ^ nums[j];
　　　　　　i++;j--;
　　　　}
　　}
    public void Rotate(int[] nums, int k) {
　　　　int len = nums.Length;
　　　　k = k % len;
　　　　reverse(nums, 0, len - k - 1);
　　　　reverse(nums, len - k, len - 1);
　　　　reverse(nums, 0, len - 1);
    }

}