As already discussed in the comments, to make things simple, you can add entries to the array to make its size a power of two, so the binary tree has the same depth for all leaves.

在评论中已经讨论的，使事情变得简单，你可以添加条目到阵列使其大小两个电源，所以二进制树的所有的叶子，相同的深度。

youdao

Just as every school child knows that water is formed by the two elements of hydrogen and oxygen in a very simple combination we all know as H2O, so deflation has its own elements of composition.

FORBES: Deflation Dissected