Compilare: main.cpp: In function 'int main()': main.cpp:50:34: 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] 50 | for( i = a.size() - 1; i < b.size(); i++ ) | ~~^~~~~~~~~~ main.cpp:53:23: 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] 53 | for( i = 0; i < a.size(); i++ ) | ~~^~~~~~~~~~ main.cpp:56:34: 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] 56 | for( i = a.size() - 1; i < b.size(); i++ ) { | ~~^~~~~~~~~~ main.cpp:62:34: 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] 62 | for( i = a.size() - 1; i < b.size(); i++ ) { | ~~^~~~~~~~~~