LeetCode 1470. Shuffle the Array

Question

Given the array nums consisting of 2n elements in the form [x1,x2,...,xn,y1,y2,...,yn].

Return the array in the form [x1,y1,x2,y2,...,xn,yn].

 

Example 1:

Input: nums = [2,5,1,3,4,7], n = 3
Output: [2,3,5,4,1,7] 
Explanation: Since x1=2, x2=5, x3=1, y1=3, y2=4, y3=7 then the answer is [2,3,5,4,1,7].

 

Example 2:

Input: nums = [1,2,3,4,4,3,2,1], n = 4
Output: [1,4,2,3,3,2,4,1]

 

Example 3:

Input: nums = [1,1,2,2], n = 2
Output: [1,2,1,2]

 

Constraints:

• 1 <= n <= 500
• nums.length == 2n
• 1 <= nums[i] <= 10^3

 

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Solution

Python

class Solution:
    def shuffle(self, nums: List[int], n: int) -> List[int]:
        lst1 = []
        lst2 = []
        lst = []
        for i in range(int(len(nums)/2)):
            lst1.append(nums[i])
        for j in range(int(len(nums)/2),len(nums)):
            lst2.append(nums[j])
    
        for k in range(len(lst1)):
            lst.append(lst1[k])
            lst.append(lst2[k])
        return lst

Java