Compilare: user.c: In function ‘main’: user.c:8:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d", &n); ^ user.c:10:11: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%d%d", &x, &y); ^ user.c:35:11: warning: ‘dr’ may be used uninitialized in this function [-Wmaybe-uninitialized] dr = dr - st + 1; ^ user.c:36:5: warning: ‘st’ may be used uninitialized in this function [-Wmaybe-uninitialized] st++; ^