AS1 A Chinese Girls' Amusement

 1 // File Name: a.cpp
 2 // Author: darkdream
 3 // Created Time: 2015年03月21日 星期六 23时08分24秒
 4 
 5 #include<vector>
 6 #include<list>
 7 #include<map>
 8 #include<set>
 9 #include<deque>
10 #include<stack>
11 #include<bitset>
12 #include<algorithm>
13 #include<functional>
14 #include<numeric>
15 #include<utility>
16 #include<sstream>
17 #include<iostream>
18 #include<iomanip>
19 #include<cstdio>
20 #include<cmath>
21 #include<cstdlib>
22 #include<cstring>
23 #include<ctime>
24 #define LL long long
25 using namespace std;
26 char str[2005];
27 int num[2005];
28 int len ;
29 void solve()
30 {
31    for(int i = 0 ;i <= len; i++)
32        num[i] = str[i] - ‘0‘;
33    for(int i = 0 ;i <= len/2 ;i ++ )
34    {
35        swap(num[i],num[len-i]); 
36    }
37 }
38 void chu(){
39   int tmp = 0 ; 
40   for(int i= len ;i >= 0; i --)
41   {
42       int k = (tmp * 10 + num[i]);
43       num[i] = k /2; 
44       tmp = k % 2; 
45   }
46   if(num[len] == 0 )
47       len -- ; 
48 }
49 void jian(){
50    for(int i = 0 ;i <= len ;i ++)
51    {
52        if(num[i] == 0 )
53            num[i] = 9;
54        else{num[i] -- ; 
55            break;
56        }
57    }
58    if(num[len] == 0)
59       len -- ; 
60 }
61 void print()
62 {
63   for(int i = len; i >= 0 ;i --)
64   {
65     printf("%d",num[i]);
66   }
67   printf("\n");
68 }
69 int main(){
70     freopen("china.in","r",stdin);
71     freopen("china.out","w",stdout);
72     scanf("%s",str);
73     len = strlen(str);
74     len-- ;
75     solve();
76     if(num[0] % 2 == 1)
77     {
78        chu();
79        print();
80        return 0 ; 
81     }
82     chu();
83     jian();
84     while(num[0]%2 == 0)
85         jian();
86     print();
87 return 0;
88 }