Compilare: main.cpp: In function 'void f_first_half(int, int)': main.cpp:26:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:26:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:29:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:29:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 29 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:32:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for (; i < b.size(); i++) | ~~^~~~~~~~~~ main.cpp:39:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for (; i < a.size(); i++) | ~~^~~~~~~~~~ main.cpp: In function 'long long int f_second_half(int, int)': main.cpp:61:12: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:61:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 61 | while (i < a.size() && i < b.size() && a[i] == b[i]) | ~~^~~~~~~~~~ main.cpp:64:9: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:64:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | if (i == a.size() || i == b.size()) { | ~~^~~~~~~~~~~ main.cpp:67:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 67 | for (; i < b.size(); i++) | ~~^~~~~~~~~~ main.cpp:74:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | for (; i < a.size(); i++) | ~~^~~~~~~~~~