Compilare: user.cpp: In function ‘void prepare()’: user.cpp:42:25: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (a[i].x < a[j].x && det(a[i], a[j], a[k]) < 0 || ^ user.cpp: In function ‘void citire()’: user.cpp:20:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &n, &k); ^ user.cpp:22:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d", &a[i].x, &a[i].y); ^ user.cpp: In function ‘int main()’: user.cpp:96:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("popandai.in", "r", stdin); ^ user.cpp:97:41: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("popandai.out", "w", stdout); ^