Compilare: main.cpp: In function 'int main()': main.cpp:40:12: warning: unused variable 'x' [-Wunused-variable] double x=det(v[1], v[2], v[3]); ^ main.cpp:30:43: 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:31:45: 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:33:20: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ main.cpp:35:42: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] scanf("%lf%lf", &v[i].x, &v[i].y); ^ main.cpp:32:25: warning: 'ii' may be used uninitialized in this function [-Wmaybe-uninitialized] int n,i,top,nr,ok=0,ii,minx=2000000000,miny=2000000000; ^~