Compilare: main.cpp: In function 'int main()': main.cpp:91:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 91 | for (int i = 2; i < sir.size(); ++i) | ~~^~~~~~~~~~~~ main.cpp:99:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 99 | for (int i = 2; i < sir.size(); ++i) | ~~^~~~~~~~~~~~ main.cpp:106:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 106 | for (int i = 2; i < sir.size(); ++i) | ~~^~~~~~~~~~~~