1250.cpp

这些是我到目前在PKU上做出的题目

#include <iostream.h>
#include <string.h>

bool a[26],fa[26];
int i,n,t,l,h;
char c[80];

int main()
{
	cin>>n;
	while (n!=0)
	{
		for (i=0;i<=25;i++)
			a[i]=fa[i]=0;
		cin>>c;t=0;h=0;
		l=strlen(c)-1;
		for (i=0;i<=l;i++)
		{
			if (a[c[i]-'A'])
			{
				if (!fa[c[i]-'A'])
					h=h-1;
			}
			else
			{
				a[c[i]-'A']=1;
				if (h<n)
					h++;
				else
				{
					fa[c[i]-'A']=1;
					t++;
				}
			}
		}
		if (t==0)
			cout<<"All customers tanned successfully.\n";
		else
			cout<<t<<" customer(s) walked away.\n";
		cin>>n;
	}
	return 0;
}