Compilare: main.c: In function 'main': main.c:46:24: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] else if(u[j]==2&&v[i]==2) ^ main.c:29:15: warning: suggest explicit braces to avoid ambiguous 'else' [-Wparentheses] if(b[i]!=z&&d[j]!=z) ^ main.c:6:5: 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); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:36: 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); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ main.c:6:69: 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); ^~~~~~~~~~~~~~ main.c:9:13: 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]; ^~~~~~~~~~~~~~~~~~~~