Compilare: main.cpp: In member function 'void Graph::transpose()': main.cpp:44:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for (j = 0; j < _list[i].size(); j++) | ~~^~~~~~~~~~~~~~~~~ main.cpp: In member function 'void Graph::dfs_ctc(int, std::vector<int>&)': main.cpp:54:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 54 | for (int i = 0; i < _list[node].size(); i++) { | ~~^~~~~~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:105:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::vector<int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 105 | for (int i = 0; i < ans.size(); i++) { | ~~^~~~~~~~~~~~ main.cpp:106:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 106 | for (int j = 0; j < ans[i].size(); j++) | ~~^~~~~~~~~~~~~~~