import java.util.*; public class Main { private static Map<string> map = new LinkedHashMap<string>(); static { 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"); } private static String defaultRes = "unknown command"; public static void main(String[] args) { Scanner sc = new Scanner(System.in); while(sc.hasNextLine()) { String str = sc.nextLine(); String[] strArr = str.split(" "); String results = defaultRes; if(strArr.length == 1) // 只有一个命令字符串 { for(String s1 : map.keySet()) { if(s1.startsWith(str) && s1.split(" ").length == 1) { results = map.get(s1); break; } } } else { //第一个命令串 String com1 = strArr[0]; //第二个命令串 String com2 = strArr[1]; //是否唯一的标志 int flag = 0 ; for(String s1 : map.keySet()) { String[] keyArr = s1.split(" "); if(keyArr.length == 1) { continue; } String key1 = keyArr[0]; String key2 = keyArr[1]; if(key1.startsWith(com1) && key2.startsWith(com2)) { results = map.get(s1); flag ++; } } //匹配不到或者是匹配到多个，都算匹配失败 if(flag == 0 || flag > 1) { results = defaultRes; } } System.out.println(results); } } }</string></string>