Compilare: user.cpp: In function ‘void convexHull()’: user.cpp:95:6: warning: unused variable ‘m’ [-Wunused-variable] int m = n; ^ user.cpp: In function ‘int main()’: user.cpp:130:9: warning: unused variable ‘xi’ [-Wunused-variable] double xi,yi; ^ user.cpp:130:12: warning: unused variable ‘yi’ [-Wunused-variable] double xi,yi; ^ user.cpp:127:39: 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:128:44: 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); ^ user.cpp:129:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:136:47: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lf %lf", &points[i].x, &points[i].y); ^