Compilare: main.cpp: In function 'int main()': main.cpp:114:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 114 | for(int j = 0; j < s.size(); j++) | ~~^~~~~~~~~~