Compilare: user.cpp: In function ‘void prim()’: user.cpp:27:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i=0;i<v[nod].size();i++) { ~^~~~~~~~~~~~~~ user.cpp:15:15: warning: unused variable ‘c’ [-Wunused-variable] int nod,i,c,nou,c_muchie; ^ user.cpp: In function ‘int main()’: user.cpp:42:11: warning: unused variable ‘j’ [-Wunused-variable] int i,j,x,y,c; ^