POJ 1250

 1 #include<iostream>
 2 #include<set>
 3 #include<string>
 4 using namespace std;
 5 
 6 set<char> coll;
 7 set<char>::iterator pos;
 8 
 9 int main()
10 {
11     //freopen("acm.acm","r",stdin);
12     int n;
13     int i;
14     int man_now;
15     int len;
16     int ans;
17     string s;
18     while(cin>>n,n)
19     {
20         man_now = 0;
21         ans = 0;
22         getchar();
23         getline(cin,s);
24         //cout<<s<<endl;
25         len = s.length();
26         for(i = 0; i < len; ++ i)
27         {
28             pos = coll.find(s[i]);
29             if(pos == coll.end())
30             {
31                 coll.insert(s[i]);
32                 //++ man_now;
33                 if(coll.size() > n)
34                 {
35                     ++ ans;
36                 }
37             }
38             else
39             {
40                 coll.erase(s[i]);
41             //    -- man_now;
42             }
43         }
44         if(ans == 0)
45         {
46             cout<<"All customers tanned successfully."<<endl;
47         }
48         else
49         {
50             cout<<ans<<" customer(s) walked away."<<endl;
51         }
52     }
53 }

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