Compilare: main.cpp: In function 'double merge(int, int, int, std::vector<std::pair<double, double> >, double)': main.cpp:28:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < new_points.size(); i++) { ~~^~~~~~~~~~~~~~~~~~~ main.cpp:29:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = 1; j < 9 && (i + j) < new_points.size(); j++) { ~~~~~~~~^~~~~~~~~~~~~~~~~~~