Compilare: user.c: In function ‘main’: user.c:45:16: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] else if(u[j]==2&&v[i]==2) ^ user.c:28:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(b[i]!=z&&d[j]!=z) ^ user.c:5:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("magic2.in","r",stdin),freopen("magic2.out","w",stdout),scanf("%d",&n); ^ user.c:5:43: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("magic2.in","r",stdin),freopen("magic2.out","w",stdout),scanf("%d",&n); ^ user.c:5:74: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] freopen("magic2.in","r",stdin),freopen("magic2.out","w",stdout),scanf("%d",&n); ^ user.c:8:14: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&a[i][j]),l[i]+=a[i][j],c[j]+=a[i][j]; ^