Compilare: main.cpp: In function 'int main()': main.cpp:26:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for (int i = 0; i < A.size(); i++) | ~~^~~~~~~~~~ main.cpp:28:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for (int i = A.size(); i < B.size(); i++) | ~~^~~~~~~~~~ main.cpp:35:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for (int i = 0; i < A.size(); i++) { | ~~^~~~~~~~~~ main.cpp:54:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | for (int i = A.size(); i < B.size(); i++) { | ~~^~~~~~~~~~ main.cpp:65:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | for (int i = 0; i < B.size() && nr < 1000; i++) | ~~^~~~~~~~~~