Compilare: user.cpp: In function ‘int main()’: user.cpp:24:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[1].size();++i) q.push({{-v[1][i].x,v[1][i].y},1}); ~^~~~~~~~~~~~ user.cpp:36:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<v[nod].size();++i) ~^~~~~~~~~~~~~~ user.cpp:42:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0;i<sol.size();++i) g<<sol[i].x<<' '<<sol[i].y<<'\n'; ~^~~~~~~~~~~