http://520it.com/binarytrees/
http://btv.melezinek.cz/binary-search-tree.html
https://www.cs.usfca.edu/~galles/visualization/Algorithms.html
https://yangez.github.io/btree-js/
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原文：https://www.cnblogs.com/sweetorangezzz/p/12976699.html
