Compilare: user.cpp: In function ‘int main()’: user.cpp:33:38: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0; i<a[q.front()].size(); i++) ^ user.cpp:13:12: warning: unused variable ‘j’ [-Wunused-variable] int i, j, prim, ultim, viz[50001], d[50001], nr[50001], x, y, c, n, m; ^ user.cpp:13:15: warning: unused variable ‘prim’ [-Wunused-variable] int i, j, prim, ultim, viz[50001], d[50001], nr[50001], x, y, c, n, m; ^