Compilare: user.cpp: In function ‘void Fill(int, int)’: user.cpp:29:10: warning: unused variable ‘i’ [-Wunused-variable] int i,j,i_next, j_next; ^ user.cpp:29:12: warning: unused variable ‘j’ [-Wunused-variable] int i,j,i_next, j_next; ^ user.cpp: In function ‘void bfs()’: user.cpp:70:39: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<v[head].size(); i++ ) ^