1 #include<stdio.h> 2 3 long long hlt(long long n) 4 { 5 long long t; 6 if(n==1) 7 t=2; 8 else 9 t=2+3*hlt(n-1); 10 return t; 11 } 12 int main() 13 { 14 int n; 15 while(~scanf("%d",&n)) 16 printf("%lld\n",hlt(n)); 17 }
原文：http://www.cnblogs.com/qq188380780/p/6082869.html