Java 队列 + HashMap

运行时间：10ms
占用内存：9216KB
注意点：

1. 主要是需要维护队列长度，保证其不超过8。

2. HashMap用来记录出现过的错误，不能移除

   import java.io.BufferedReader;
   import java.io.IOException;
   import java.io.InputStreamReader;
   import java.util.HashMap;
   import java.util.LinkedList;
   import java.util.Queue;
   public class Main{
    public static void main(String[] args) throws IOException {
        InputStreamReader is = new InputStreamReader(System.in);
        BufferedReader br = new BufferedReader(is);
        String str = br.readLine();
        Queue<String> queue = new LinkedList<>();
        HashMap<String,Integer> map = new HashMap<>();
        while(str != null) {
            String[] strs = str.split("\\\\");
            String info = strs[strs.length - 1];
            if (map.containsKey(info)) {
                map.put(info, map.get(info) + 1);
            } else {
                map.put(info, 1);
                queue.add(info);
            }
            if(queue.size() > 8){
                String temp = queue.poll();
                map.put(temp,0);
            }
            str = br.readLine();
        }
        while(!queue.isEmpty()){
            String temp = queue.poll();
            System.out.println(process(temp)+ " " + map.get(temp));
        }
    }
   
    private static String process(String str){
        String[] strs = str.split(" ");
        int len1 = strs[0].length();
        if(len1 <= 16)
            return str;
        else{
            return strs[0].substring(len1 - 16, len1) + " " +strs[1];
        }
    }
   }