拿下拿下

#include<iostream>
using namespace std;
int main(){
int a[200010];
int n;
cin>>n;
for(int i=1;i<=n;i++){
cin>>a[i];
}
int sum=0;
for(int i=1;i<=n;i++){
if(i%2==0) cout<<a[i-1]<<" ";
else cout<<a[i+1]<<" ";
}
return 0;
}