D - Half of and a Half 大数

D - Half of and a Half

Time Limit:1000MS     Memory Limit:32768KB     64bit IO Format:%I64d & %I64u

Submit Status Practice HDU 1592

Description

Gardon bought many many chocolates from the A Chocolate Market (ACM). When he was on the way to meet Angel, he met Speakless by accident.
"Ah, so many delicious chocolates! I'll get half of them and a half!" Speakless said.
Gardon went on his way, but soon he met YZG1984 by accident....
"Ah, so many delicious chocolates! I'll get half of them and a half!" YZG1984 said.
Gardon went on his way, but soon he met Doramon by accident....
"Ah, so many delicious chocolates! I'll get half of them and a half!" Doramon said.
Gardon went on his way, but soon he met JGShining by accident....
"Ah, so many delicious chocolates! I'll get half of them and a half!" JGShining said.
.
.
.
After
had had met N people , Gardon finally met Angel. He gave her half of
the rest and a half, then Gardon have none for himself. Could you tell
how many chocolates did he bought from ACM?

Input

Input contains many test cases.
Each case have a integer N, represents the number of people Gardon met except Angel. N will never exceed 1000;

Output

For every N inputed, tell how many chocolates Gardon had at first.

Sample Input

2

Sample Output

7

 #include<cstdio>
 #include<string.h>
 using namespace std;
 int ans[][];
 int main()
 {
     //memset(ans,0,sizeof(ans));
     int n,i,j;
     while(scanf("%d",&n)!=EOF)
     {

         //i=300;
 memset(ans,,sizeof(ans));
 ans[]=;
         while(n--)
         {
             int c=;
             int s=;

             for(i=;i>=;i--)
             {
                 if(i==)
                  s=ans[i]*++c;
                  else s=ans[i]*+c;
                 ans[i]=s%;
                 c=s/;

             }
         }
         for(i=;i<=;i++) if(ans[i]!=) break;
         j=i;
         for(j=i;j<=;j++) printf("%d",ans[j]);
         printf("\n");
     }
     return ;
 }