java入门：map

题目在这里

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;
 
 
public class Main{  
    public static Map<String, Integer> mymap = new HashMap<String, Integer>();
    public static int n;
    public static String str;
     
    public static void main(String[] args){
        Scanner IN = new Scanner(System.in);
        while(IN.hasNext()){
            n = IN.nextInt();
            mymap.clear();
            int cnt=0;
            while(n-- > 0){
                str = IN.next();    
                if(!mymap.containsKey(str)){
                    mymap.put(str, Integer.valueOf(++cnt));
                }
                System.out.println(mymap.get(str));
            }
        }       
    }
}