Compilare: user.c: In function ‘main’: user.c:4:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("taxi.in","r",stdin),freopen("taxi.out","w",stdout),scanf("%d",&t); ^ user.c:4:41: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("taxi.in","r",stdin),freopen("taxi.out","w",stdout),scanf("%d",&t); ^ user.c:4:70: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("taxi.in","r",stdin),freopen("taxi.out","w",stdout),scanf("%d",&t); ^ user.c:6:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d%d%d%d%d",&a,&b,&e,&f,&g,&h),i=(e<g?(g-e):(e-g)),j=(f<h?(h-f):(f-h)),c=e<g?e:g,d=f<h?f:h,m=e<g?g:e,n=f<h?h:f; ^