Compilare: main.cpp: In function 'int main()': main.cpp:109:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 109 | for(int j=0;j<s.size();j++) | ~^~~~~~~~~ main.cpp:135:30: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 135 | for(int j=0;j<s.size();j++) | ~^~~~~~~~~