Compilare: main.cpp: In function 'void solve()': main.cpp:88:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 88 | for(int j=0; j<s.size(); j++){ | ~^~~~~~~~~