Compilare: main.cpp: In function 'void f_first_half(long long int, long long int)': main.cpp:27:12: 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] 27 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:27:28: 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] 27 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:30:9: 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] 30 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:30:26: 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] 30 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:33:16: 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] 33 | for (; i < b.size(); i++) | ~~^~~~~~~~~~ main.cpp:40:16: 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] 40 | for (; i < a.size(); i++) | ~~^~~~~~~~~~ main.cpp: In function 'long long int f_second_half(long long int, long long int)': main.cpp:62:12: 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 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:62:28: 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 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:65:9: 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] 65 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:65:26: 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] 65 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:68:16: 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] 68 | for (; i < b.size(); i++) | ~~^~~~~~~~~~ main.cpp:75:16: 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] 75 | for (; i < a.size(); i++) | ~~^~~~~~~~~~