我正在做Complete Binary Tree Inserter - LeetCode,但是出现了["CBTInserter","insert","insert","get_root"] [[[1,null,2]],[3],[4],[]]这样的 input ,这是合理的吗?[1,null,2]不是一个 complete binary tree 呀。难道我哪里理解错误了?🤕
["CBTInserter","insert","insert","get_root"]
[[[1,null,2]],[3],[4],[]]
[1,null,2]