题解 | #配置文件恢复#

import java.util.*;
public class Main{
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        
        Map<String,String> map = new HashMap<String,String>();
        
        map.put("reset","reset what");
        map.put("reset board","board fault");
        map.put("board add","where to add");
        map.put("board delete","no board at all");
        map.put("reboot backplane","impossible");
        map.put("backplane abort","install first");
        while(in.hasNext()){
            String input_str = in.nextLine();
        if(input_str.contains(" "))
        {
            //两条输入匹配
            String[] a = input_str.split(" ");
            ArrayList<String> list = new ArrayList<String>();
            if(a.length!=2){
                System.out.println("unknown command");
            }else{
                for(Map.Entry entry:map.entrySet()){
                    String str = entry.getKey().toString();
                    if(str.contains(" ")){
                        String[] b = str.split(" ");
                        if(a[0].length()<=b[0].length()&&a[1].length()<=b[1].length()){
                            if(b[0].contains(a[0])&&b[0].indexOf(a[0])==0&&b[1].contains(a[1])&&b[1].indexOf(a[1])==0)
                                list.add(str);
                        }
                    }
                }
                if(list.size()==1)
                {
                    System.out.println(map.get(list.get(0)));
                }else{
                    System.out.println("unknown command");
                }
            }
            
        }else{
            //一个输出匹配
            String str1 = "reset";
            int i ;
            if(input_str.length()<=str1.length()){
                if(str1.contains(input_str)&&str1.indexOf(input_str)==0)
                    System.out.println(map.get(str1));
                else{
                     System.out.println("unknown command");
                }
            }
            else{
                System.out.println("unknown command");
            }
        }
      }
    }
}