Compilare: main.cpp: In function 'bool has_cicle(std::vector<int>*, int)': main.cpp:39:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | for (int j = 0; j < adj[i].size(); j++) | ~~^~~~~~~~~~~~~~~ main.cpp:62:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 62 | for (int i = 0; i < adj[u].size(); i++) | ~~^~~~~~~~~~~~~~~