hdu 2085 核反应堆

#include<iostream>using namespace std;int main(){long long a[34]={1},b[34]={0};for(int i=1;i<34;i++){a[i]=3*a[i-1]+2*b[i-1];b[i]=a[i-1]+b[i-1];}int n;while(cin>>n){if(n==-1)break;cout<<a[n]<<", "<<b[n]<<endl;}return 0;}