Compilare: user.cpp: In function ‘void DFS1(int)’: user.cpp:66:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0; i < G[x].size(); ++i) ^ user.cpp: In function ‘void DFS2(int)’: user.cpp:77:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( i = 0; i < GT[x].size(); ++i) ^ user.cpp: In function ‘void Afisare()’: user.cpp:89:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for( j = 0; j < ap[i].size(); ++j) ^