Compilare: main.cpp: In function 'void dfs(int)': main.cpp:21:16: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 21 | for (i=0; i<g[nod].size(); i++) | ~^~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:74:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 74 | for (j=0; j<s.size(); j++) | ~^~~~~~~~~