Compilare: user.c: In function ‘main’: user.c:30:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("royfloyd.in", "r",stdin); ^ user.c:31:9: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen("royfloyd.out", "w",stdout); ^ user.c:32:7: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf( "%d", &n); ^ user.c:36:13: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &dist[i][j]); ^