Compilare: user.cpp: In function ‘void bfs()’: user.cpp:27:48: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for ( j = 0; j < v[ nod ].size(); j++ ) ^ user.cpp: In function ‘int main()’: user.cpp:39:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, x, y, ok; ^ user.cpp:39:21: warning: unused variable ‘ok’ [-Wunused-variable] int i, j, x, y, ok; ^