leetcode189

public class Solution {
    public void reverse(int[] nums, int start, int end)
        {
            while (start < end)
            {
                int temp = nums[start];
                nums[start] = nums[end];
                nums[end] = temp;
                start++;
                end--;
            }
        }

        public void Rotate(int[] nums, int k)
        {
            k %= nums.Length;
            reverse(nums, 0, nums.Length - 1);
            reverse(nums, 0, k - 1);
            reverse(nums, k, nums.Length - 1);
        }
}