Compilare: main.cpp: In function 'int main()': main.cpp:50:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 50 | for (i = 1; i <= s.size(); i++) | ~~^~~~~~~~~~~ main.cpp:55:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for (i = 0; i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp:58:17: warning: unused variable 'how' [-Wunused-variable] 58 | int how = 0; | ^~~ main.cpp:80:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 80 | if (k == s.size() - 1) | ~~^~~~~~~~~~~~~~~