Compilare: main.cpp: In function 'double get_min_dist(double, std::vector<Point>)': main.cpp:36:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < a.size() - 1; i++) ~~^~~~~~~~~~~~~~ main.cpp:37:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < a.size() and (a[j].y - a[i].y) < d_min; j++) ~~^~~~~~~~~~ main.cpp: In function 'double find_closest_points(std::vector<Point>, std::vector<Point>, int, int)': main.cpp:58:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < b.size(); i++) ~~^~~~~~~~~~ main.cpp:67:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < b.size(); i++) ~~^~~~~~~~~~