Compilare: user.cpp: In function ‘int main()’: user.cpp:10:22: warning: unused variable ‘x’ [-Wunused-variable] int i,front,back,x,sum=0,j; ^ user.cpp:10:24: warning: unused variable ‘sum’ [-Wunused-variable] int i,front,back,x,sum=0,j; ^ user.cpp:10:30: warning: unused variable ‘j’ [-Wunused-variable] int i,front,back,x,sum=0,j; ^ user.cpp:11:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secventa.in","r",stdin); ^ user.cpp:12:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("secventa.out","w",stdout); ^ user.cpp:13:24: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.cpp:15:40: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] for(i=1;i<=n;i++) scanf("%d",&a[i]); ^