Compilare: user.cpp: In member function ‘double Plan::Divide(int, int)’: user.cpp:72:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(i = 0; i<LY.size()-1; i++) ^ user.cpp:73:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(j=i+1; j<LY.size() && ( LY[j].y - LY[i].y < d3 ); j++) ^ user.cpp: In constructor ‘Plan::Plan(std::ifstream&)’: user.cpp:101:27: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i=0; i<X.size(); i++) cout<<X[i].x<<" "<<X[i].y<<"\n"; ^