Compilare: user.cpp: In function ‘long long int naive(const std::vector<Point*>&, Pair&)’: user.cpp:55:41: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < points.size() - 1; i++) { ^ user.cpp:56:45: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i + 1; j < points.size(); j++) { ^ user.cpp: In function ‘long long int minStripDistance(std::vector<Point*>, long long int, Pair&)’: user.cpp:99:36: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < strip.size(); i++) { ^ user.cpp:100:44: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int j = i +1 ; j < strip.size() && (strip[j]->y - strip[i]->y) < min; j++) { ^