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Leetcode problem 1470 states: 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].

Clarifying Questions

1. Q: Is the input always a list of even length where the length of the list is 2n? A: Yes.
2. Q: Is there any constraint on the values of the elements in the list, such as them being integers? A: Yes, elements are integers as per standard Leetcode constraints.

Strategy

To solve this problem, you can utilize a simple iteration approach. Follow these steps:

1. Divide the array into two halves.
2. Iterate through these two halves simultaneously.
3. Combine elements from each half alternately into a new result list.

Code

Here’s how you can implement this:

def shuffle(nums, n):
    result = []
    for i in range(n):
        result.append(nums[i])
        result.append(nums[i + n])
    return result

Explanation

1. Initialize an empty list result which will store the final shuffled array.
2. Loop through the first half of the array using an index i.
3. Append the i-th element of the first half and the i-th element of the second half to the result list.
4. Continue until you have added all the elements from both halves alternately to the result list.
5. Return the result list.

Time Complexity Analysis

• Time Complexity: The algorithm runs in O(n) time where n is the input list’s half-length (or 2n is the full length), as it involves iterating through the array linearly once.
• Space Complexity: The space complexity is O(n) for the resulting list, not considering the input list space.

This offers a fairly efficient solution for the problem at hand.

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