Compilare: main.cpp: In function 'int main()': main.cpp:23:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 23 | for(int j = 0; j < sir.size(); j++){ | ~~^~~~~~~~~~~~ main.cpp:26:77: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | if(sir[j + 1] == '-' || sir[j + 1] == '+' || sir[j + 1] == '=' || j == sir.size() - 1){ | ~~^~~~~~~~~~~~~~~~~