这道题可以说基本涵盖了树的大部分知识点——树的创建，树的生成，树的删除，树的BFS（宽度优先搜索）。个人认为是学习树时很具有价值的一道题目。
题目意思很好理解，讨论区的题解写的也比本人优秀太多了，这里就不具体分析了。
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