Compilare: user.cpp: In function ‘int main()’: user.cpp:19:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=0;j<v[zona].size();++j) ^ user.cpp:11:17: warning: unused variable ‘ok’ [-Wunused-variable] int n,i,j,x,ok,aparitie,elem,zona,ap=-6; ^ user.cpp:34:11: warning: ‘elem’ may be used uninitialized in this function [-Wmaybe-uninitialized] g<<elem<<" "<<ap; ^