Algorithm Puzzles: Rotate Array

Algorithm Puzzles everyday every week sometimes: Rotate Array

Puzzle

Puzzle from leetcode:

Given an integer array nums, rotate the array to the right by k steps, where k is non-negative.

Example 1:

Input: nums = [1,2,3,4,5,6,7], k = 3
Output: [5,6,7,1,2,3,4]
Explanation:
rotate 1 steps to the right: [7,1,2,3,4,5,6]
rotate 2 steps to the right: [6,7,1,2,3,4,5]
rotate 3 steps to the right: [5,6,7,1,2,3,4]
Example 2:

Input: nums = [-1,-100,3,99], k = 2
Output: [3,99,-1,-100]
Explanation:
rotate 1 steps to the right: [99,-1,-100,3]
rotate 2 steps to the right: [3,99,-1,-100]

Solution

class Solution:
    def rotate(self, nums: List[int], k: int) -> None:
        """
        Do not return anything, modify nums in-place instead.
        """
        nums_len = len(nums)
        if k >= nums_len:
            k = k % len(nums)
        res = nums[-k:] + nums[:nums_len-k]
        for i in range(0, nums_len):
            nums[i] = res[i]

T.C.: O(N)
S.C.: O(N)