题解 | #配置文件恢复#

import java.util.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ArrayList<String> arry = new ArrayList<>();
        while (scanner.hasNext()){
            String s = scanner.nextLine();
            arry.add(s);
        }
        for (int i = 0; i <arry.size(); i++) {
            System.out.println(reback(arry.get(i)));
        }
    }
    public static String reback(String str) {
        LinkedHashMap<String, String> hm1 = new LinkedHashMap<>();
        hm1.put("reset", "reset what");
        hm1.put("reset board", "board fault");
        hm1.put("board add", "where to add");
        hm1.put("board delete", "no board at all");
        hm1.put("reboot backplane", "impossible");
        hm1.put("backplane abort", "install first");
        hm1.put("he he", "unknown command");

        LinkedHashMap<String, Integer> hm2 = new LinkedHashMap<>();
        hm2.put("reset", 0);
        hm2.put("reset board", 0);
        hm2.put("board add", 0);
        hm2.put("board delete", 0);
        hm2.put("reboot backplane", 0);
        hm2.put("backplane abort", 0);
        hm2.put("he he", 0);

        String[] split = str.split(" ");
        if (split.length == 1) {
            int length = split[0].length();
            String s = "reset";
            String split1 = s.substring(0, split[0].length());
            if (split[0].equals(split1)) {
                return hm1.get("reset");
            } else {
                return hm1.get("he he");
            }

        } else if (split.length == 2) {
            String sleft = split[0];
            String sright = split[1];
            int lengthl = sleft.length();
            int lengthr = sright.length();
            String key = "";
            for (String keys : hm1.keySet()) {
                String[] splitk = keys.split(" ");
                if (splitk.length==1){
                    continue;
                }
                if (lengthl>splitk[0].length()||lengthr>splitk[1].length()){
                    continue;
                }
                String subleft = splitk[0].substring(0, lengthl);
                String subright = splitk[1].substring(0, lengthr);
                if (sleft.equals(subleft) && sright.equals(subright)) {
                    key = keys;
                    hm2.put(keys, hm2.get(keys) + 1);
                }
            }
            int count = 0;
            for (String keyw : hm2.keySet()) {
                count += hm2.get(keyw);
            }
            if (count == 1) {
                return hm1.get(key);
            } else {
                return hm1.get("he he");
            }
        }
        return hm1.get("he he");
    }
}