Compilare: main.cpp: In function 'int main()': main.cpp:27:39: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 27 | if (paranteze_s.find(sir_citit[i])!= -1) | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~ main.cpp:34:39: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 34 | if (paranteze_d.find(sir_citit[i])!= -1) | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~