Compilare: user.cpp: In function ‘void sortare_topologica3(int)’: user.cpp:43: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DFS_GH(int)’: user.cpp:58: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DFS_H(int)’: user.cpp:71: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DFS_T(int)’: user.cpp:88: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void sortare_topologica2(int)’: user.cpp:102: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DFS_CTC(int)’: user.cpp:113: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void sortare_topologica(int)’: user.cpp:121: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:158: warning: comparison between signed and unsigned integer expressions user.cpp:193: warning: comparison between signed and unsigned integer expressions