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("raze.in","r",stdin),freopen("raze.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("raze.in","r",stdin),freopen("raze.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("raze.in","r",stdin),freopen("raze.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",&n,&m); ^ user.c:9:18: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]),c[i][j]=b[i][j]=e[i][j]=d[i][j]=0; ^