diff --git a/CMakeLists.txt b/CMakeLists.txt
index 85ca2c3..1e500f5 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,4 +18,6 @@ project(alogrithm_2024)
 add_executable(P1031 ${CMAKE_CURRENT_LIST_DIR}/P1031/main.cpp)
 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
+add_executable(P2661 ${CMAKE_CURRENT_LIST_DIR}/P2661/main.cpp)
+
+add_executable(P2615 ${CMAKE_CURRENT_LIST_DIR}/P2615/P2615.cpp)
\ No newline at end of file
diff --git a/P2615/P2615.cpp b/P2615/P2615.cpp
new file mode 100644
index 0000000..f25f159
--- /dev/null
+++ b/P2615/P2615.cpp
@@ -0,0 +1,10 @@
+#include <iostream>
+#include <istream>
+
+using std::cin,std::cout;
+
+int main(){
+    std::iostream::sync_with_stdio(false),cin.tie(0),cout.tie(0);
+
+    
+}
\ No newline at end of file
diff --git a/P2661/main.cpp b/P2661/main.cpp
index b1c16e5..afb4612 100644
--- a/P2661/main.cpp
+++ b/P2661/main.cpp
@@ -14,7 +14,7 @@ std::queue<int> q;
 int ans;
 
 int main(){
-    std::iostream::sync_with_stdio(false),cin.tie(0),cout.tie(0);
+    std::iostream::sync_with_stdio(false),cin.tie(nullptr),cout.tie(nullptr);
 
     std::cin>>n;
     for(int i=1;i<=n;i++){
@@ -49,5 +49,5 @@ int main(){
         }while(now!=start);
         ans=std::max(ans,loop_size);
     }
-    std::cout<<ans<<"\n";
+    cout<<ans<<"\n";
 }
\ No newline at end of file