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.

用了空间度为O（n）的最简单的解法，不过也被accept了，晚些时候补上其他的两种方法。

class Solution {
public:
    void rotate(int nums[], int n, int k) {
    int *copy = new int[n];
    memcpy(copy, nums, n * sizeof(int));

    for (int i = 0; i < n; i++)
    {
        nums[(i + k) % n] = copy[i];
    }

    }
};