Compilare: user.c: In function ‘main’: user.c:17:3: warning: use of ‘ll’ length modifier with ‘f’ type character [-Wformat=] fscanf(fin, "%llf %llf\n", &x[i], &y[i]); ^ user.c:17:3: warning: use of ‘ll’ length modifier with ‘f’ type character [-Wformat=] user.c:28:2: warning: use of ‘ll’ length modifier with ‘f’ type character [-Wformat=] fprintf(fout, "%llf\n", res); ^ user.c:12:8: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d\n", &n); ^ user.c:17:9: warning: ignoring return value of ‘fscanf’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%llf %llf\n", &x[i], &y[i]); ^