diff --git a/CMakeLists.txt b/CMakeLists.txt
index 84a27fadfbcbcf7902c3ba54a019f103de3ce553..7386a5a775a373abc65aca67a7a7bd6ce515aecf 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -3,6 +3,8 @@ project(stl_debug VERSION 0.1.0 LANGUAGES C CXX)
 
 set(CMAKE_CXX_STANDARD 17)
 
+set(default_build_type "Debug")
+
 INCLUDE_DIRECTORIES(
     include
 )
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 802fad6ca111135e508c1daf2e15e660d9483cae..722da0930f6369e8ca428ce8099f3a116d5a551c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,3 +1,3 @@
 add_executable(
-    stl_test main.cpp Human.cpp Student.cpp logging.cpp
+    lab0_debug main.cpp Human.cpp Student.cpp logging.cpp
 )
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 898c43825320b3c5267cccc32e5027a2bdd7df0a..14e5a6ccbfb882b82a0c39713501f3ba707cf679 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,3 +1,5 @@
+#include <iostream>
+#include <string>
 #include <stdio.h>
 #include "Human.hpp"
 #include "Student.hpp"
@@ -11,7 +13,11 @@ class check{
     }
 };
 
-int main(int, char**){
+int main(int argc, char** argv){
+    if(argc == 1 || std::string(argv[1]) != "-t"){
+        std::cerr << "error: invalid argument\n";
+        exit(-1);
+    }
     printf("Hello, from stl_debug!\n");
     std::vector<Human*> vec;
     Human human(25, "John Doe");
@@ -21,9 +27,17 @@ int main(int, char**){
     for (const auto& h : vec) {
         std::cout << h->print();
     }
+    // auto student1 = new Student();   //TODO: Error 1 : why?
     auto student1 = static_cast<Student*>(vec.back());
-    // check check1 = check(student);
+    // check check1 = check(student);   //TODO: Error 2 : why?
     check check1 = check(student1);
-    LOG(DEBUG) << student1->print();
-    LOG(WARNING) << human.print();
+    // LOG(DEBUG) << student1->print();
+    // LOG(WARNING) << human.print();
+
+    // std::list<int> list;
+    // list.push_back(1);
+    // for(auto i: list){
+    //     list.remove(i);
+    // }
+    return 0;
 }