hdu 1165 Eddy's research II

http://acm.hdu.edu.cn/showproblem.php?pid=1165

 1 #include <cstdio>

 2 #include <cstring>

 3 #include <algorithm>

 4 #define ll __int64

 5 using namespace std;

 6 

 7 ll A(ll m, ll n)

 8 {

 9     if(n==0) return A(m-1,1);

10     else if(m==1) return n+2;

11     else if(m==2) return 2*n+3;

12     else return A(m,n-1)*2+3;

13 }

14 

15 int main()

16 {

17     ll m,n;

18     while(scanf("%I64d%I64d",&m,&n)!=EOF)

19     {

20         printf("%I64d\n",A(m,n));

21     }

22     return 0;

23 }

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