Compilare: user.cpp: In function ‘void conex(int)’: user.cpp:19:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<a[nod].size(); i++) ^ user.cpp: In function ‘int main()’: user.cpp:42:29: warning: unused variable ‘j’ [-Wunused-variable] int i, m, n, x1, y1, z, j, s, q, t, u=0; ^