Compilare: main.cpp:15:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 15 | main() | ^~~~ main.cpp: In function 'int main()': main.cpp:28:23: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for (int i = 0; i < s1.size(); i++) | ~~^~~~~~~~~~~ main.cpp:48:31: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 48 | for (int i = s1.size(); i < s2.size(); i++) | ~~^~~~~~~~~~~