HDU 1592 Half of and a Half（大数）

Half of and a Half

Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)
Total Submission(s): 1179    Accepted Submission(s): 539

Problem 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<cstring>
 #include<algorithm>
 using namespace std;
 struct node
 {
     int a[];
 }s[];
 int main()
 {
     int i,j,t,n;
     s[].a[]=;
     for(i=;i<=;i++)
     {
         int r=;
         for(j=;j<;j++)
         {
             s[i].a[j]=s[i-].a[j]*+r;

             r=s[i].a[j]/;

             s[i].a[j]%=;

         }
         t=;
         while(s[i].a[t]+>)
         {
             s[i].a[t]=;
             t++;
         }
         s[i].a[t]+=;
     }
     while(scanf("%d",&n)!=EOF)
     {
         for(i=;i>=,s[n].a[i]==;i--);
         for(j=i;j>=;j--)
             printf("%d",s[n].a[j]);
         printf("\n");

     }
     return ;
 }