Compilare: user.cpp: In function ‘void afisare()’: user.cpp:41:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 0; j < G[i].size(); j++) ~~^~~~~~~~~~~~~ user.cpp: In function ‘void BFS(int)’: user.cpp:63:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[nod].size(); i++) { ~~^~~~~~~~~~~~~~~ user.cpp: In function ‘void sortare_topologica()’: user.cpp:77:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (j=0; j < G[i].size(); j++) ~~^~~~~~~~~~~~~ user.cpp:73:9: warning: unused variable ‘k’ [-Wunused-variable] int k, i, j; ^