Compilare: user.cpp: In function ‘int main()’: user.cpp:19:26: warning: unused variable ‘j’ [-Wunused-variable] int n,i,max=-1999,cate=0,j,rec=0,min=99999; ^ user.cpp:19:28: warning: unused variable ‘rec’ [-Wunused-variable] int n,i,max=-1999,cate=0,j,rec=0,min=99999; ^ user.cpp:16:33: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("granita.in","r",stdin); ^ user.cpp:17:35: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen ("granita.out","w",stdout); ^ user.cpp:21:16: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d",&n); ^ user.cpp:25:41: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf ("%d%d",&v[i].cs,&v[i].cd); ^