题解 | #配置文件恢复#

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
    private static String[][] twos = {{"reset", "board", "board fault"},//reset board	board fault
            {"board", "add", "where to add"},//board add	where to add
            {"board", "delete", "no board at all"},//board delete	no board at all
            {"reboot", "backplane", "impossible"},//reboot backplane	impossible
            {"backplane", "abort", "install first"}};//backplane abort	install first

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String s = br.readLine();
        while (s != null) {
            String[] t = s.split(" ");
            if (t.length == 1) {
                if ("reset".startsWith(s)) {
                    System.out.println("reset what");
                } else {
                    System.out.println("unknown command");
                }
            } else if (t.length == 2) {
                int matchCount = 0;
                int matchId = 0;
                for (int i = 0; i < twos.length; i++) {
                    if (twos[i][0].startsWith(t[0]) && twos[i][1].startsWith(t[1])) {
                        matchCount++;
                        matchId = i;
                    }
                }
                if (matchCount == 1) {
                    System.out.println(twos[matchId][2]);
                } else {
                    System.out.println("unknown command");
                }
            }


            s = br.readLine();
        }
    }
}