Compilare: user.cpp: In function ‘int main()’: user.cpp:19:16: warning: unused variable ‘dist’ [-Wunused-variable] double dist=sqrt((x-xx)*(x-xx)+(y-yy)*(y-yy)); ^ user.cpp:83:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<v.size(); i++) cout<<v[i]<<" "; ^