Compilare: user.cpp: In function ‘void afisare()’: user.cpp:13:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < L.size(); i++) ^ user.cpp: In function ‘void visit(int)’: user.cpp:31:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0 ; i < G[node].size(); i++) ^