Compilare: main.cpp: In function 'void dfs(int)': main.cpp:31:28: warning: comparison of integer expressions of different signedness: 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare] 31 | if (str.size() == n + mx - 1) | ~~~~~~~~~~~^~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:58:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 58 | for (int i = 1; i < sol.size(); i++) | ~~^~~~~~~~~~~~