diff --git a/CMakeLists.txt b/CMakeLists.txt
index c603ec2..a386677 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,7 +3,7 @@ cmake_minimum_required(VERSION 3.10)
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 add_compile_options(-Wall)
 
-set(CMAKE_CXX_STANDARD 17)
+set(CMAKE_CXX_STANDARD 20)
 set(CMAKE_CXX_STANDARD_REQUIRED ON)
 
 if("${CMAKE_BUILD_TYPE}" STREQUAL "Release")
@@ -16,4 +16,6 @@ endif()
 project(alogrithm_2024)
 
 add_executable(P1031 ${CMAKE_CURRENT_LIST_DIR}/P1031/main.cpp)
-add_executable(P1031_pro ${CMAKE_CURRENT_LIST_DIR}/P1031/pro.cpp)
\ No newline at end of file
+add_executable(P1031_pro ${CMAKE_CURRENT_LIST_DIR}/P1031/pro.cpp)
+
+add_executable(P2661 ${CMAKE_CURRENT_LIST_DIR}/P2661/main.cpp)
\ No newline at end of file
diff --git a/P2661/main.cpp b/P2661/main.cpp
new file mode 100644
index 0000000..294989d
--- /dev/null
+++ b/P2661/main.cpp
@@ -0,0 +1,3 @@
+int main(){
+    
+}
\ No newline at end of file