Compilare: user.cpp: In function ‘int main()’: user.cpp:12:51: warning: format ‘%Lf’ expects argument of type ‘long double*’, but argument 2 has type ‘double*’ [-Wformat=] for (i=1;i<=n;i++) scanf("%Lf %Lf",&t[i].x,&t[i].y); ^ user.cpp:12:51: warning: format ‘%Lf’ expects argument of type ‘long double*’, but argument 3 has type ‘double*’ [-Wformat=] user.cpp:17:17: warning: format ‘%Lf’ expects argument of type ‘long double’, but argument 2 has type ‘double’ [-Wformat=] printf("%Lf",sol); ^ user.cpp:9:29: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("aria.in","r",stdin); ^ user.cpp:10:31: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("aria.out","w",stdout); ^ user.cpp:11:15: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&n); ^ user.cpp:12:52: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for (i=1;i<=n;i++) scanf("%Lf %Lf",&t[i].x,&t[i].y); ^