Compilare: user.cpp: In function ‘std::vector<std::pair<std::pair<int, int>, std::pair<int, int> > > analyze(int, int)’: user.cpp:28:26: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0;i<segs.size();i++) ^ user.cpp: In function ‘int main()’: user.cpp:164:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<points.size();i++) ^ user.cpp:171:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=1;i<points.size();i++) ^