Compilare: main.cpp: In function 'int main()': main.cpp:25:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(int i = 1; i < a.size(); i++) | ~~^~~~~~~~~~ main.cpp:20:9: warning: unused variable 'm' [-Wunused-variable] 20 | int m = b.size(); | ^