Compilare: user.cpp: In function ‘void convexHull()’: user.cpp:69:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < points.size(); i++) ^ user.cpp:89:34: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 1; i < points.size(); i++) ^ user.cpp:91:32: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while (i < (points.size() - 1) && orientation(p0, points[i],points[i+1]) == 0) ^ user.cpp: In function ‘int main()’: user.cpp:119:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infasuratoare.in","r",stdin); ^ user.cpp:120:44: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("infasuratoare.out","w",stdout); ^