Compilare: user.cpp: In function ‘bool gibt(PDD)’: user.cpp:36:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] if(ant+i<pts.size() && pts[ant+i].x<=arg.x) { ^ user.cpp: In function ‘int main()’: user.cpp:80:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<pts.size(); ++i) ^ user.cpp:81:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int j=i+1; j<pts.size(); ++j) ^