Compilare: user.c: In function ‘f’: user.c:8:25: warning: variable ‘rr’ set but not used [-Wunused-but-set-variable] long long nr=0,z,vv,rr; ^ user.c:8:22: warning: variable ‘vv’ set but not used [-Wunused-but-set-variable] long long nr=0,z,vv,rr; ^ user.c: In function ‘main’: user.c:40:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("tarabe.in","r",stdin); ^ user.c:41:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("tarabe.out","w",stdout); ^ user.c:42:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&n,&k); ^ user.c:44:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&r[i],&v[i]); ^