Compilare: main.cpp: In function 'void Dfs(int)': main.cpp:34:26: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 34 | for(int k = 0; k < s.size(); k++) | ~~^~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:114:30: 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 k = 0; k < a[i].s.size(); k++) | ~~^~~~~~~~~~~~~~~