Compilare: main.cpp: In function 'int main()': main.cpp:27:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 27 | while(poz < intrebare.length() - 1) | ~~~~^~~~~~~~~~~~~~~~~~~~~~~~ main.cpp:40:25: warning: unused variable 'val_aux' [-Wunused-variable] 40 | int val_aux = s1.top(); | ^~~~~~~ main.cpp:23:18: warning: unused variable 's1_mare' [-Wunused-variable] 23 | bool s1_mare = false; | ^~~~~~~