#include<iostream> #include<iomanip> using namespace std; int main() { int n,temp = 0; cin >> n; int a[1001]; for (int i = 0; i < n; i++) { cin >> a[i]; } if(n % 2 == 1){ n--; //TODO } for(int i=0;i<n;i+=2){ temp = a[i]; a[i] = a[i + 1]; a[i + 1] = temp; } for(int i=0;i<n;i++){ cout<<a[i]<<" "; } }