from typing import List class Solution: def rotate(self, nums: List[int], k: int) -> None: """ Do not return anything, modify nums in-place instead. """ def reverse(arr: List[int], start: int, end: int): while start < end: arr[start], arr[end] = arr[end], arr[start] start += 1 end -= 1 n = len(nums) k = k % n reverse(nums, 0, n - 1) reverse(nums, 0, k - 1) reverse(nums, k, n - 1)