#include<bits/stdc++.h> using namespace std; int main(){ /** int a[11]; int max,x;//max 最大值 x下标 cin>>max; x = 1; for(int i = 2;i<=10;i++){ cin>>a[i]; if( max <a[i]){ max = a[i]; x=i; } } cout<<x; int a[1001] ,b[1001],n; long long sum=0; cin>>n; for(int i = 1;i<=n;i++){ cin>>a[i]; } for(int i = 1;i<=n;i++){ cin>>b[i]; } for(int i = 1;i<=n;i++){ sum+=a[i] * b[i]; } cout<<sum;**/ int n;//长度 int a[101]; cin>>n; for(int i = 1;i<=n;i++){ cin>>a[i]; } for(int i = 2;i<=n;i+=2){ int temp; temp = a[i]; a[i]= a[i-1]; a[i-1]=temp; } for(int i = 1;i<=n;i++){ cout<<a[i]<<" "; } }