Compilare: main.cpp: In function 'int main()': main.cpp:18:13: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | while(j < a.size()) | ~~^~~~~~~~~~ main.cpp:28:21: 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 = 0;i < b.size(); ++i) | ~~^~~~~~~~~~ main.cpp:34:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | if(j == a.size()){ | ~~^~~~~~~~~~~