Compilare: user.c: In function ‘main’: user.c:15:18: warning: unused variable ‘m’ [-Wunused-variable] int i,j,j2,k,m; ^ user.c:15:13: warning: unused variable ‘j2’ [-Wunused-variable] int i,j,j2,k,m; ^ user.c:12:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("dlboss.in","r",stdin); ^ user.c:13:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("dlboss.out","w",stdout); ^ user.c:14:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&N,&T); ^ user.c:17:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&t[i],&c[i]); ^