Compilare: user.cpp: In function ‘int main()’: user.cpp:200:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i = 0; i < ans.size (); i ++) ^ user.cpp:127:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("dmg.in", "r", stdin); ^ user.cpp:128:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("dmg.out", "w", stdout); ^ user.cpp:130:21: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d", &n); ^ user.cpp:132:45: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%lf%lf", &P [i].x, &P [i].y); ^