diff --git a/CMakeLists.txt b/CMakeLists.txt
new file mode 100644
index 0000000..50e51b7
--- /dev/null
+++ b/CMakeLists.txt
@@ -0,0 +1,4 @@
+cmake_minimum_required(VERSION 3.10)
+project(BigInt)
+add_subdirectory(data)
+add_subdirectory(src)
\ No newline at end of file
diff --git a/data/CMakeLists.txt b/data/CMakeLists.txt
new file mode 100644
index 0000000..74ca77f
--- /dev/null
+++ b/data/CMakeLists.txt
@@ -0,0 +1,7 @@
+set(PROJECT_NAME ${CMAKE_PROJECT_NAME})
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_FLAGS "-g -O2")
+include_directories(${PROJECT_SOURCE_DIR}/include)
+link_directories(${PROJECT_SOURCE_DIR}/src)
+add_executable(C1T1 Interger1/1.cpp)
+target_link_libraries(C1T1 int2048)
\ No newline at end of file
diff --git a/include/int2048.h b/include/int2048.h
new file mode 100644
index 0000000..3c18f13
--- /dev/null
+++ b/include/int2048.h
@@ -0,0 +1,87 @@
+#pragma once
+#ifndef SJTU_BIGINTEGER
+#define SJTU_BIGINTEGER
+
+// Integer 1:
+// 实现一个有符号的大整数类，只需支持简单的加减
+
+// Integer 2:
+// 实现一个有符号的大整数类，支持加减乘除，并重载相关运算符
+
+// 请不要使用除了以下头文件之外的其它头文件
+#include <complex>
+#include <cstdio>
+#include <cstring>
+#include <iostream>
+#include <vector>
+
+// 请不要使用 using namespace std;
+
+namespace sjtu {
+class int2048 {
+  // todo
+ public:
+  // 构造函数
+  int2048();
+  int2048(long long);
+  int2048(const std::string &);
+  int2048(const int2048 &);
+
+  // 以下给定函数的形式参数类型仅供参考，可自行选择使用常量引用或者不使用引用
+  // 如果需要，可以自行增加其他所需的函数
+  // ===================================
+  // Integer1
+  // ===================================
+
+  // 读入一个大整数
+  void read(const std::string &);
+  // 输出储存的大整数，无需换行
+  void print();
+
+  // 加上一个大整数
+  int2048 &add(const int2048 &);
+  // 返回两个大整数之和
+  friend int2048 add(int2048, const int2048 &);
+
+  // 减去一个大整数
+  int2048 &minus(const int2048 &);
+  // 返回两个大整数之差
+  friend int2048 minus(int2048, const int2048 &);
+
+  // ===================================
+  // Integer2
+  // ===================================
+
+  int2048 operator+() const;
+  int2048 operator-() const;
+
+  int2048 &operator=(const int2048 &);
+
+  int2048 &operator+=(const int2048 &);
+  friend int2048 operator+(int2048, const int2048 &);
+
+  int2048 &operator-=(const int2048 &);
+  friend int2048 operator-(int2048, const int2048 &);
+
+  int2048 &operator*=(const int2048 &);
+  friend int2048 operator*(int2048, const int2048 &);
+
+  int2048 &operator/=(const int2048 &);
+  friend int2048 operator/(int2048, const int2048 &);
+
+  int2048 &operator%=(const int2048 &);
+  friend int2048 operator%(int2048, const int2048 &);
+
+  friend std::istream &operator>>(std::istream &, int2048 &);
+  friend std::ostream &operator<<(std::ostream &, const int2048 &);
+
+  friend bool operator==(const int2048 &, const int2048 &);
+  friend bool operator!=(const int2048 &, const int2048 &);
+  friend bool operator<(const int2048 &, const int2048 &);
+  friend bool operator>(const int2048 &, const int2048 &);
+  friend bool operator<=(const int2048 &, const int2048 &);
+  friend bool operator>=(const int2048 &, const int2048 &);
+};
+}  // namespace sjtu
+
+#endif
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
new file mode 100644
index 0000000..22fa710
--- /dev/null
+++ b/src/CMakeLists.txt
@@ -0,0 +1,5 @@
+set(PROJECT_NAME ${CMAKE_PROJECT_NAME})
+set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_FLAGS "-g -O2")
+include_directories(${PROJECT_SOURCE_DIR}/include)
+add_library(int2048 STATIC int2048.cpp)
\ No newline at end of file
diff --git a/src/int2048.cpp b/src/int2048.cpp
new file mode 100644
index 0000000..e69de29