rt，教了51次才找出来:(
原因可能跟这个类似

造数据的人的锅。
明显的在 Windows 下造数据。
Windows 下换行是 \r\n，Linux 下是 \n，你的程序会多读入一个 \r，所以要特判 \r。
$\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,$——complete_binary_tree