Compilare: main.cpp: In function 'int main()': main.cpp:18:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for(int i = 0; i < s2.size();i++) | ~~^~~~~~~~~~~ main.cpp:20:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 20 | for(int j = 0; j < s1.size(); j++) | ~~^~~~~~~~~~~