Compilare: user.c: In function ‘rf’: user.c:37:7: warning: suggest explicit braces to avoid ambiguous ‘else’ [-Wparentheses] if(i != j) ^ user.c: In function ‘main’: user.c:10:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("rf.in", "r", stdin); ^ user.c:11:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("rf.out", "w", stdout); ^ user.c:12:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &n); ^ user.c:15:9: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &a[i][j]); ^