java 相当于c++中的freopen的语句
System.setIn(new BufferedInputStream(new FileInputStream("c://1754.in")));
Main函数必须改成
public static void main(String[] args) throws IOException
java 相当于c++中的freopen的语句
System.setIn(new BufferedInputStream(new FileInputStream("c://1754.in")));
Main函数必须改成
public static void main(String[] args) throws IOException