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.

代码

public class Solution {
    public void rotate(int[] nums, int k) {
        int len=nums.length;
        if(k==0 || k==len) return;
        if(k>len) k=k-len;
        int[] result=new int[len];
        int result_index=0;
        int j=0;
        for(int i=k;i>=1;i--){
            result[result_index]=nums[len-i];
            result_index++;
        }
        while(result_index<len){
            result[result_index]=nums[j];
            result_index++;
            j++;
        }
        for(int m=0;m<len;m++){
        	   nums[m]=result[m];
        }
    }
}