diff --git a/src/problem.java b/src/problem.java
deleted file mode 100644
index ea5a9b1..0000000
--- a/src/problem.java
+++ /dev/null
@@ -1,121 +0,0 @@
-import java.util.Random;
-import java.util.Scanner;
-import java.io.IOException;
-
-public class problem {
-  String level;
-  String name;
-
-  public void display() {
-    try {
-      new ProcessBuilder("clear").inheritIO().start().waitFor();
-    } catch (IOException | InterruptedException e) {
-      //e.printStackTrace();
-    }
-    //        try {
-    //            Runtime.getRuntime().exec("cmd /c cls").waitFor();
-    //        } catch (IOException | InterruptedException e) {
-    //            e.printStackTrace();
-    //        }
-    System.out.println("=== 中小学数学卷子自动生成程序 ===");
-  }
-
-  public void start(User user) {
-    level = user.level;
-    name = user.username;
-    while (true) {
-      display();
-      System.out.println("欢迎你 " + user.username + " " + level);
-      System.out.println("输入1开始出题");
-      System.out.println("输入2切换出题年级");
-      System.out.println("输入-1退出登录，返回开始界面");
-      Scanner sc = new Scanner(System.in);
-      int flag = 0;
-      while (true) {
-        String str = sc.next();
-        try {
-          flag = Integer.parseInt(str);
-        } catch (NumberFormatException e) {
-          flag = 0;
-        }
-        if (flag == 1 || flag == 2 || flag == -1)
-          break;
-        else
-          System.out.println("请输入正确的操作");
-      }
-      if (flag == 1) {
-        if (f1() == 0)
-          continue;
-      }
-      if (flag == 2) {
-        if (f2() == 0)
-          continue;
-      }
-      if (flag == -1)
-        break;
-    }
-  }
-
-  public int f1() {
-    System.out.println("正在为" + level + "出题");
-    System.out.println("请在10-30的范围内输入出题数目，输入-1返回操作界面");
-    Scanner sc = new Scanner(System.in);
-    int num = 0;
-    while (true) {
-      String str = sc.next();
-      try {
-        num = Integer.parseInt(str);
-      } catch (NumberFormatException e) {
-        num = 0;
-      }
-      if (num == -1)
-        break;
-      if (num >= 10 && num <= 30)
-        break;
-      else
-        System.out.println("请输入10-30范围的出题数");
-    }
-    if (num == -1) {
-      return 0;
-    }
-    if (level.equals("小学")) {
-      Primaryproblem p1 = new Primaryproblem();
-      p1.start(num, name);
-    } else if (level.equals("初中")) {
-      Middleproblem m1 = new Middleproblem();
-      m1.start(num, name);
-    } else if (level.equals("高中")) {
-      Highproblem h1 = new Highproblem();
-      h1.start(num, name);
-    }
-    System.out.println("已出题完成,输入-1返回操作界面");
-    while (!sc.next().equals("-1")) {
-      continue;
-    }
-    return 0;
-  }
-
-  public int f2() {
-    System.out.println("请输入想要切换的出题年级,输入-1返回操作界面");
-    String num;
-    Scanner sc = new Scanner(System.in);
-    while (true) {
-      num = sc.next();
-      if (num.equals("-1"))
-        break;
-      if (num.equals("初中") || (num.equals("小学")) || (num.equals("高中")))
-        break;
-      else
-        System.out.println("请输入小学、初中和高中三个选项中的一个");
-    }
-    if (num.equals("-1")) {
-      return 0;
-    }
-    level = num;
-    System.out.println("已成功修改出题年级为" + level + ",输入-1返回操作界面");
-    while (!sc.next().equals("-1")) {
-      continue;
-    }
-    return 0;
-  }
-}
\ No newline at end of file