POJ 1250

#include<iostream>
#include<set>
#include<string>
using namespace std;

set<char> coll;
set<char>::iterator pos;

int main()
{
    //freopen("acm.acm","r",stdin);
    int n;
    int i;
    int man_now;
    int len;
    int ans;
    string s;
    while(cin>>n,n)
    {
        man_now = 0;
        ans = 0;
        getchar();
        getline(cin,s);
        //cout<<s<<endl;
        len = s.length();
        for(i = 0; i < len; ++ i)
        {
            pos = coll.find(s[i]);
            if(pos == coll.end())
            {
                coll.insert(s[i]);
                //++ man_now;
                if(coll.size() > n)
                {
                    ++ ans;
                }
            }
            else
            {
                coll.erase(s[i]);
            //    -- man_now;
            }
        }
        if(ans == 0)
        {
            cout<<"All customers tanned successfully."<<endl;
        }
        else
        {
            cout<<ans<<" customer(s) walked away."<<endl;
        }
    }
}

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