Compilare: main.cpp: In function 'int main()': main.cpp:485:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 485 | for (i = 0; i < a.size(); ++i) | ~~^~~~~~~~~~ main.cpp:495:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 495 | for (; i < b.size(); ++i) | ~~^~~~~~~~~~