Compilare: main.cpp: In function 'int main()': main.cpp:39:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for (int i=1;i<A.size();i++) { | ~^~~~~~~~~ main.cpp:50:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for (int i=0;i<B.size();i++) { | ~^~~~~~~~~ main.cpp:55:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | if (k >= A.size() - 1) { | ~~^~~~~~~~~~~~~~~