Compilare: user.cpp: In function ‘void sortare_topologica3(int)’: user.cpp:41: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DFS_GH(int)’: user.cpp:56: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DFS_H(int)’: user.cpp:69: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DFS_T(int)’: user.cpp:86: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void sortare_topologica2(int)’: user.cpp:100: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void DFS_CTC(int)’: user.cpp:111: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘void sortare_topologica(int)’: user.cpp:119: warning: comparison between signed and unsigned integer expressions user.cpp: In function ‘int main()’: user.cpp:156: warning: comparison between signed and unsigned integer expressions user.cpp:191: warning: comparison between signed and unsigned integer expressions