Compilare: user.c: In function ‘main’: user.c:18:13: warning: unused variable ‘y’ [-Wunused-variable] int x=0,y=0; ^ user.c:12:13: warning: unused variable ‘j2’ [-Wunused-variable] int i,j,j2,k,m=0; ^ user.c:9:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("dlboss.in","r",stdin); ^ user.c:10:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("dlboss.out","w",stdout); ^ user.c:11:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N,&T); ^ user.c:15:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&t[i],&c[i]); ^