diff --git a/src/Primaryproblem.java b/src/Primaryproblem.java
deleted file mode 100644
index ffe7238..0000000
--- a/src/Primaryproblem.java
+++ /dev/null
@@ -1,120 +0,0 @@
-import java.util.Random;
-import java.util.Scanner;
-
-public class Primaryproblem implements Makeproblem {
-  private static Random random = new Random();
-  static int basic = 1;
-  static int basic1 = 1;
-  String name = "1";
-  String time = "1";
-  int num = 1;
-
-  public static void main(String[] args) {
-    Primaryproblem p1 = new Primaryproblem();
-    p1.name = "张三1";
-    Timemanage t1 = new Timemanage();
-    p1.time = t1.timeget();
-    for (int i = 0; i < 15; i++) {
-      basic = 1;
-      basic1 = 1;
-      System.out.println((i + 1) + ". " + p1.generateSmartExpression());
-      p1.num++;
-    }
-  }
-
-  void start(int num, String username) {
-    name = username;
-    Timemanage t1 = new Timemanage();
-    time = t1.timeget();
-    for (int i = 0; i < num; i++) {
-      basic = 1;
-      basic1 = 1;
-      System.out.println((i + 1) + ". " + generateSmartExpression());
-      System.out.println("");
-    }
-  }
-
-  @Override
-  public String generateSmartExpression() {
-    int operatorCount = random.nextInt(3) + 1;
-    int b2 = random.nextInt(operatorCount) + 1;
-    String file = time;
-    String result;
-    while (true) {
-      int flag = 0;
-      result = buildExpression(operatorCount, b2);
-      filemanage f1 = new filemanage();
-      f1.fileread(name);
-      f1.fileread(name);
-      for (String i : f1.array) {
-        String[] parts = i.split("\\.", 2);
-        String j = parts.length > 1 ? parts[1] : i;
-        if (result.equals(j)) {
-          flag = 1;
-        }
-      }
-      if (flag == 1) {
-        continue;
-      }
-      f1.filecreate(name, file);
-      f1.filewrite(name, file, num + "." + result);
-      f1.filewrite(name, file, " ");
-      num++;
-      break;
-    }
-    return result;
-  }
-
-  @Override
-  public String buildExpression(int operatorCount, int b2) {
-    if (operatorCount == 1) {
-      return generateSimpleExpression(b2);
-    }
-
-    // 随机决定分割点来添加括号
-    int splitPoint = random.nextInt(operatorCount - 1) + 1;
-
-    String leftPart = (splitPoint > 1 && random.nextBoolean()) ?
-            "(" + buildExpression(splitPoint, b2) + ")" :
-            buildExpression(splitPoint, b2);
-
-    String rightPart = (operatorCount - splitPoint > 1 && random.nextBoolean()) ?
-            "(" + buildExpression(operatorCount - splitPoint, b2) + ")" :
-            buildExpression(operatorCount - splitPoint, b2);
-
-    char operator = getRandomOperator("+-*/");
-    return leftPart + " " + operator + " " + rightPart;
-  }
-
-  @Override
-  public String generateSimpleExpression(int b2) {
-    int a = random.nextInt(100) + 1;
-    int b = random.nextInt(100) + 1;
-    char op = getRandomOperator("+-*/");
-    if (basic1 == 3) {
-      return a + "";
-    }
-    if (basic == b2) {
-      op = getRandomOperator("+-*/");
-      basic1++;
-      return a + " " + op + " " + b;
-    } else {
-      basic++;
-    }
-    if (random.nextInt(2) == 0) {
-      return a + "";
-    }
-    if (random.nextBoolean()) {
-      basic1++;
-      return a + " " + op + " " + b;
-    } else {
-      basic1++;
-      return "(" + a + " " + op + " " + b + ")";
-    }
-  }
-
-  @Override
-  public char getRandomOperator(String operators) {
-    return operators.charAt(random.nextInt(operators.length()));
-  }
-}