189. Rotate Array

class Solution:
    def rotate(self, nums: List[int], k: int) -> None:
        """
        Do not return anything, modify nums in-place instead.
        """
        n = len(nums)
        k %= n
        if n < 2 or k == 0:
            return
        nums[:] = nums[::-1]
        nums[:k] = nums[:k][::-1]
        nums[k:] = nums[k:][::-1]

class Solution {
    public void rotate(int[] nums, int k) {
        if (nums == null) {
            return;
        }
        int n = nums.length;
        k %= n;
        if (n < 2 || k == 0) {
            return;
        }

        rotate(nums, 0, n - 1);
        rotate(nums, 0, k - 1);
        rotate(nums, k, n - 1);
    }

    private void rotate(int[] nums, int i, int j) {
        while (i < j) {
            int t = nums[i];
            nums[i] = nums[j];
            nums[j] = t;
            ++i;
            --j;
        }
    }
}

/**
 * @param {number[]} nums
 * @param {number} k
 * @return {void} Do not return anything, modify nums in-place instead.
 */
var rotate = function (nums, k) {
    k %= nums.length;
    nums.splice(0, 0, ...nums.splice(-k, k))
};