Compilare: user.cpp: In function ‘int main()’: user.cpp:27:15: warning: unused variable ‘s’ [-Wunused-variable] long long s,cate,i,j,pp,f; ^ user.cpp:27:17: warning: unused variable ‘cate’ [-Wunused-variable] long long s,cate,i,j,pp,f; ^ user.cpp:27:24: warning: unused variable ‘j’ [-Wunused-variable] long long s,cate,i,j,pp,f; ^ user.cpp:27:26: warning: unused variable ‘pp’ [-Wunused-variable] long long s,cate,i,j,pp,f; ^ user.cpp:28:34: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sume2.in","r",stdin); ^ user.cpp:29:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("sume2.out","w",stdout); ^ user.cpp:30:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%lld",&n,&k); ^ user.cpp:32:26: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&v[i]); ^