Compilare: main.cpp: In function 'int dfs(int)': main.cpp:18:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 18 | for( int i = 0; i < adj[node].size(); ++i ) | ~~^~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:57:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for( int j = 0; j < adj[i].size(); ++j ) | ~~^~~~~~~~~~~~~~~