//1.逆序输出 #include<iostream> using namespace std; int a[100]; int main() { int n; cin>>n; for(int i=1;i<=n;i++) cin>>a[i]; for(int i=n;i>=1;i--) if(a[i]%3==0) cout<<a[i]<<" "; cout<<endl; for(int i=n;i>=1;i--) if(i%3==0) cout<<a[i]<<" "; cout<<endl; return 0; }