package main

import "fmt2"

func shuffle(nums []int, n int) []int {
 for i := 0; i < n; i++ {
  nums[i*2] = (nums[i]&1023)<<10 | nums[i*2]
 }
 for j := n; j < len(nums); j++ {
  nums[2*(j-n)+1] = (nums[j]&1023)<<10 | nums[2*(j-n)+1]
 }

 for i, _ := range nums {
  nums[i] = nums[i] >> 10
 }
 return nums
}

func main() {
 var nums = []int{2, 5, 1, 3, 4, 7}
 var n = 3
 fmt2.Println(shuffle(nums, n))
}