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("gradina3.in","r",stdin),freopen("gradina3.out","w",stdout),scanf("%d%d%d",&n,&p,&k); ^ user.c:4:45: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("gradina3.in","r",stdin),freopen("gradina3.out","w",stdout),scanf("%d%d%d",&n,&p,&k); ^ user.c:4:78: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("gradina3.in","r",stdin),freopen("gradina3.out","w",stdout),scanf("%d%d%d",&n,&p,&k); ^ user.c:6:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d%d",&i,&j),a[i][j]=1; ^