Compilare: main.cpp: In function 'void f_first_half(long long int, long long int)': main.cpp:29:12: 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] 29 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:29:28: 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] 29 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:32:9: 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] 32 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:32:26: 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] 32 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:35:16: 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] 35 | for (; i < b.size(); i++) | ~~^~~~~~~~~~ main.cpp:42:16: 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] 42 | for (; i < a.size(); i++) | ~~^~~~~~~~~~ main.cpp: In function 'long long int f_second_half(long long int, long long int)': main.cpp:66:12: 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] 66 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:66:28: 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] 66 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:69:9: 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] 69 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:69:26: 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] 69 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:72:16: 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] 72 | for (; i < b.size(); i++) | ~~^~~~~~~~~~ main.cpp:79:16: 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] 79 | for (; i < a.size(); i++) | ~~^~~~~~~~~~