按照我的模版解决即可：

import java.util.*; import java.io.*; public class Main { public static PrintWriter out = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out))); public static Read in = new Read(); public static void main(String[] args) throws IOException { // 写代码 out.close(); } } class Read { StringTokenizer st = new StringTokenizer(""); BufferedReader bf = new BufferedReader(new InputStreamReader(System.in)); String next() throws IOException { while (!st.hasMoreTokens()) { st = new StringTokenizer(bf.readLine()); } return st.nextToken(); } String nextLine() throws IOException { return bf.readLine(); } int nextInt() throws IOException { return Integer.parseInt(next()); } long nextLong() throws IOException { return Long.parseLong(next()); } double nextDouble() throws IOException { return Double.parseDouble(next()); } }