hdu 2085 核反应堆

#include<stdio.h>int main(void){    int n, i;    __int64 g[34] = {1};    __int64 d[34] = {0};    for (i = 1; i < 34; i++)    {        g[i] = 3 * g[i - 1] + 2 * d[i - 1];        d[i] = g[i - 1] + d[i - 1];    }    while (scanf("%d", &n), n != -1)        printf("%I64d, %I64d\n", g[n], d[n]);    return 0;}