Compilare: user.cpp: In function 'void DFS(int)': user.cpp:103: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'int DFST(int)': user.cpp:116: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void face_graf()': user.cpp:151: warning: comparison between signed and unsigned integer expressions user.cpp:152: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void sort_topologic()': user.cpp:169: warning: comparison between signed and unsigned integer expressions user.cpp: In function 'void atribuire_valori()': user.cpp:184: warning: comparison between signed and unsigned integer expressions