Compilare: main.cpp: In function 'void Compute_Hull()': main.cpp:33:8: warning: unused variable 'up' [-Wunused-variable] point up[5 + N], down[5 + N]; ^~ main.cpp:33:19: warning: unused variable 'down' [-Wunused-variable] point up[5 + N], down[5 + N]; ^~~~ main.cpp: In function 'int main()': main.cpp:67:41: 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); ^ main.cpp:68:43: 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); ^ main.cpp:69:17: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:72:45: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf", &p[i].first, &p[i].second); ^