zoj1405

简单题

#include <iostream>#include <string>using namespace std;int main(){    int num;    while(1)    {        cin >> num;        if(!num) break;        string people,nobeds;            cin >> people;        string beds;        int times = 0;        for(string::iterator it = people.begin();it != people.end();it++)        {                if(beds.find(*it) != string::npos)                {                    for(string::iterator it2 = beds.begin();it2 != beds.end();it2++)                        if(*it2 == *it)                        {                            beds.erase(it2);                            break;                        }                }                else if(beds.size() == num)                {                    if(nobeds.find(*it) != string::npos)                    times ++;                    else nobeds += *it;                }                else if(beds.size() < num)                    beds += *it;        }        if(times)        cout << times << " customer(s) walked away." <<endl;        else cout << "All customers tanned successfully." << endl;    }    return 0;}