Compilare: main.cpp:16:1: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type] 16 | main() | ^~~~ main.cpp: In function 'int main()': main.cpp:23:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for(int i=0;i<b.size();++i) | ~^~~~~~~~~ main.cpp:28:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for(int i=0;i<a.size();++i) | ~^~~~~~~~~ main.cpp:34:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(int i=1;i<a.size();++i) | ~^~~~~~~~~ main.cpp:35:22: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 35 | for(int j=1;j<b.size();++j) | ~^~~~~~~~~