Compilare: user.cpp: In function ‘int main()’: user.cpp:9:21: warning: unused variable ‘cate’ [-Wunused-variable] long long a,b,t,cate,i,j,ii,A,aux,s,q,r,c; ^ user.cpp:9:28: warning: unused variable ‘j’ [-Wunused-variable] long long a,b,t,cate,i,j,ii,A,aux,s,q,r,c; ^ user.cpp:7:37: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("interval.in","r",stdin); ^ user.cpp:8:39: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("interval.out","w",stdout); ^ user.cpp:10:35: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld%lld",&a,&b,&q); ^ user.cpp:13:32: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld",&t,&A); ^