English
1470. Shuffle the Array 
Problem Statement
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 <= 500nums.length == 2n1 <= nums[i] <= 10^3
Click to open Hints
- Use two pointers to create the new array of 2n elements. The first starting at the beginning and the other starting at (n+1)th position. Alternate between them and create the new array.
Solution:
go
package main
func shuffle(nums []int, n int) []int {
res := make([]int, n*2)
for i := 0; i < n; i++ {
// at even indices, put the slice of the array from 0 to n
res[i*2] = nums[i]
// at odd indices, put the slice of the array from n to the end
res[i*2+1] = nums[n+i]
}
return res
}
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