Compilare: main.cpp: In function 'int main()': main.cpp:47:30: 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] 47 | for(int e = 2; e < S1.size() - 1; ++e) | ~~^~~~~~~~~~~~~~~ main.cpp:57:30: 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] 57 | for(int e = 1; e < S2.size(); ++e) | ~~^~~~~~~~~~~ main.cpp:63:22: 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] 63 | if(k == S1.size() - 2) | ~~^~~~~~~~~~~~~~~~ main.cpp:81:34: 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] 81 | for(int e = 2; e < S.size() - 1; ++e) | ~~^~~~~~~~~~~~~~