Compilare: user.cpp: In function ‘std::pair<std::pair<long int, long int>, std::pair<long int, long int> > minStripDist(std::vector<std::pair<long int, long int> >, double, std::pair<std::pair<long int, long int>, std::pair<long int, long int> >)’: user.cpp:17:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long i=0;i<strip.size()-1;i++) ^ user.cpp:18:37: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(long j=i+1;j<strip.size()&&(strip[j].second-strip[i].second<mini);j++) ^