题解 | #配置文件恢复#抄大佬代码

import java.util.*;
import java.lang.*;
public class Main{
    public static void main(String[] args){
        Scanner sc=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");
        map.put("noMatch","unknown command");
        Set<String[]> set=new HashSet<>();
        for(String s : map.keySet()){
            set.add(s.split(" "));
        }
        while(sc.hasNext()){
            String[] arr=sc.nextLine().split(" ");
            String res="noMatch";
            int count=0;
            for(String[] s:set){
                //如果输入的字符串为1个
                if(arr.length==1){
                    //指令个数为2个，跳过
                    if(s.length==2){
                        continue;
                    }
                    else{
                        if(s[0].startsWith(arr[0])){
                            res=s[0];
                        }
                    }
                }
                //如果指令个数为2个，并且只有一个可以匹配
                if(arr.length==2){
                    if(s.length==1){
                        continue;
                    }
                    else{
                        if(s[0].startsWith(arr[0]) && s[1].startsWith(arr[1])){
                            res=s[0]+" "+s[1];
                            count++;
                        }
                    }
                }
            }
            System.out.println(count>1?"unknown command":map.get(res));
        }
    }
}