Compilare: main.cpp: In function 'void f_first_half(int, int)': main.cpp:28:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:28:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:31:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:31:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 31 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:34:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for (; i < b.size(); i++) | ~~^~~~~~~~~~ main.cpp:41:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 41 | for (; i < a.size(); i++) | ~~^~~~~~~~~~ main.cpp: In function 'long long int f_second_half(int, int)': main.cpp:65:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:65:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 65 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:68:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:68:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 68 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:71:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 71 | for (; i < b.size(); i++) | ~~^~~~~~~~~~ main.cpp:78:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | for (; i < a.size(); i++) | ~~^~~~~~~~~~