Compilare: user.cpp: In function ‘int main()’: user.cpp:16:17: warning: unused variable ‘T’ [-Wunused-variable] int i,j,N,C,T,x,y,temp,val,ans=-INF; ^ user.cpp:16:23: warning: unused variable ‘temp’ [-Wunused-variable] int i,j,N,C,T,x,y,temp,val,ans=-INF; ^ user.cpp:13:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("carnati.in","r",stdin); ^ user.cpp:14:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("carnati.out","w",stdout); ^ user.cpp:18:25: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&N,&C); ^ user.cpp:21:29: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d %d",&x,&y); ^