189. 轮转数组

    public void rotate(int[] nums, int k) {
        int n = nums.length;
        int[] newArr = new int[n];
        for (int i = 0; i < n; i++) {
            newArr[(i + k) % n] = nums[i];
        }
        System.arraycopy(newArr,0,nums,0,n);
    }