Compilare: main.cpp: In function 'bool ispal(std::string)': main.cpp:14:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for(int i = 1; i <= s.size() - 1; i++) | ~~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:22: warning: comparison of integer expressions of different signedness: 'int' and 'long long unsigned int' [-Wsign-compare] 57 | for(int i = 1; i <= answer; i++){ | ~~^~~~~~~~~