http://poj.org/problem?id=1250 //* @author ������<hongxp11@163.com> import java.util.ArrayList; import java.util.HashSet; import java.util.Scanner; import java.util.Set; public class Main { public static void main(String[] args) { Scanner in = new Scanner(System.in); while (true) { int num = in.nextInt(); if (num == 0) break; String customers = in.next(); int leftCustomer = 0; Set<Character> customerSet = new HashSet<Character>(); for (int i = 0; i < customers.length(); i++) { int size = customerSet.size(); if (size >= num) { if (customerSet.contains(customers.charAt(i))) { customerSet.remove(customers.charAt(i)); continue; } leftCustomer++; int index = customers.indexOf(customers.charAt(i), i + 1); if (index != -1) customers = customers.substring(0, index) + customers.substring(index + 1); } else { if (customerSet.contains(customers.charAt(i))) { customerSet.remove(customers.charAt(i)); } else customerSet.add(customers.charAt(i)); } } if (leftCustomer == 0) System.out.println("All customers tanned successfully."); else System.out.println(leftCustomer + " customer(s) walked away."); } } }
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