leetcode:Rotate Array

问题描述：

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.

 

方法一：将数组分为两个部分，先计算往前挪动的元素的位置，再将剩下的元素计算位置，注意数组下标是从‘0’开始的；

class Solution {
public:
    void rotate(int nums[], int n, int k) {
        int b[n];
        if(k>n) k %=n;
        for(int i = 0;i < k;i++)
            b[i] = nums[n-k+i];
        for(int j = k;j<n;j++)
            b[j] = nums[j-k];        
        for(int i=0;i<n;i++)
            nums[i] = b[i];
    }
};