Compilare: main.cpp: In member function 'void Task::show_matrix()': main.cpp:59:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < matrix[i].size(); j++) { ~~^~~~~~~~~~~~~~~~~~ main.cpp: In member function 'void Task::DFS_UTIL(int, int)': main.cpp:76:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < matrix[node].size(); i++) { ~~^~~~~~~~~~~~~~~~~~~~~ main.cpp: In member function 'int Task::DFS()': main.cpp:99:5: warning: no return statement in function returning non-void [-Wreturn-type] } ^