Compilare: main.cpp: In function 'void expresie()': main.cpp:18:14: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | while (p < s.size()) | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:197:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 197 | for (int i = 0; i < s.size(); i++) | ~~^~~~~~~~~~