题解 | #配置文件恢复# 为方便使用startswith

one = "reset"
two1 = ["reset", "board", "board", "reboot", "backplane"]
two2 = ["board", "add", "delete", "backplane", "abort"]
fail = "unknown command"
r = "reset what"
a = ["board fault", "where to add", "no board at all", "impossible", "install first"]

while True:
    try:
        string = input().split(" ")
        if string in [["b", "a"], ["r", "b"]] or not string[0]:
            print(fail)
        else:
            if len(string) == 1:
                if one.startswith(string[0]):
                    print(r)
                else:
                    print(fail)
            elif len(string) == 2:
                if not string[1]:
                    print(fail)
                    continue
                for i in range(5):
                    if two1[i].startswith(string[0]) and two2[i].startswith(string[1]):
                        print(a[i])
                        break
                else:
                    print(fail)
            else:
                print(fail)
    except:
        break