Compilare: main.cpp: In function 'int main()': main.cpp:42:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 42 | for (i = 1; i <= s.size(); i++) | ~~^~~~~~~~~~~ main.cpp:51:22: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 51 | if (s.size() >= i + 2) | ~~~~~~~~~^~~~~~~~