- 例如把[3,9,20,null,null,15,7]这种形式的数组或list中的null改成-1，即[3,9,20,-1,-1,15,7]
- 把[3,9,20,-1,-1,15,7]传入方法即可转换成二叉树，并返回其根节点
-
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以ArrayList或Array存储的堆转二叉树
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