Shuffle the Array

Shuffle the Array

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

Solutions

🧠 Cpp

class Solution
{
public:
    vector<int> shuffle(vector<int>& nums, const int n)
    {
        vector<int> res(nums.size());
        auto start = nums.begin(),
             middle = std::next(start,n);

        for (int i = 0; i < 2*n; i+=2)
        {
            res[i] = *start++;
            res[i+1] = *middle++;
        }

        return res;
    }
};