Compilare: user.c: In function ‘main’: user.c:5:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("invazie.in","r",stdin),freopen("invazie.out","w",stdout),scanf("%d",&t); ^ user.c:5:41: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("invazie.in","r",stdin),freopen("invazie.out","w",stdout),scanf("%d",&t); ^ user.c:5:73: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("invazie.in","r",stdin),freopen("invazie.out","w",stdout),scanf("%d",&t); ^ user.c:10:8: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%lld%lld%lld",&k,&p,&n),a=k+p,b=k-p; ^