Compilare: main.cpp: In function 'void dfs(int, std::stack<int>&, std::vector<bool>&, std::vector<std::vector<int> >&)': main.cpp:26:11: warning: unused variable 'len' [-Wunused-variable] 26 | int len = 0; | ^~~ main.cpp: In function 'int main()': main.cpp:57:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 57 | for (int i = 0; i < g.size(); i++) { | ~~^~~~~~~~~~