Compilare: user.c: In function ‘read’: user.c:28:5: warning: format ‘%ld’ expects argument of type ‘long int *’, but argument 2 has type ‘int *’ [-Wformat=] scanf("%ld", &n); ^ user.c:26:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(FIN , "r", stdin); ^ user.c:28:10: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%ld", &n); ^ user.c:32:22: warning: ignoring return value of ‘scanf’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d", &mat[ i ][ j ]); ^ user.c: In function ‘write’: user.c:61:12: warning: ignoring return value of ‘freopen’, declared with attribute warn_unused_result [-Wunused-result] freopen(FOUT, "w", stdout); ^