Compilare: main.cpp: In function 'int main()': main.cpp:13:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for (int i = 0; i < b.size(); ++i) | ~~^~~~~~~~~~ main.cpp:16:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 16 | for (int j = 0; j < a.size(); ++j) | ~~^~~~~~~~~~