Compilare: user.cpp: In function ‘void Update(int, int)’: user.cpp:20:6: warning: unused variable ‘i’ [-Wunused-variable] int i,j,el; ^ user.cpp:20:8: warning: unused variable ‘j’ [-Wunused-variable] int i,j,el; ^ user.cpp: In function ‘int BellmanFord(int, int)’: user.cpp:60:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < G[el].size(); ++i) ^