1470. Shuffle the Array.cpp

/*

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

*/

/* Solution */

class Solution {
public:
    vector<int> shuffle(vector<int>& nums, int n) {
        vector<int> v,u,ans;
        for(int I=0;I<n;I++) {
            v.push_back(nums[I]);
        }
        
        for(int I=n;I<2*n;I++) {
            u.push_back(nums[I]);
        }
        
        for(int I=0;I<n;I++) {
            ans.push_back(v[I]);
            
            ans.push_back(u[I]);
        }
        
        return ans;
    }
};