Compilare: main.cpp: In function 'int main()': main.cpp:25:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 25 | for(int i = 0; i < s.size(); i++) | ~~^~~~~~~~~~ main.cpp:18:13: warning: unused variable 'a' [-Wunused-variable] 18 | ll cer, a, b, e; | ^ main.cpp:18:16: warning: unused variable 'b' [-Wunused-variable] 18 | ll cer, a, b, e; | ^ main.cpp:18:19: warning: unused variable 'e' [-Wunused-variable] 18 | ll cer, a, b, e; | ^