Compilare: main.cpp: In function 'int main()': main.cpp:24:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 24 | for (int i = 0; i < n.size(); ++i) | ~~^~~~~~~~~~ main.cpp:37:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for (int i = 0; i < sol.size(); ++i) | ~~^~~~~~~~~~~~