turtle doves, And a partridge in a pear tree. On the ninth day of Christmas, my true love sent to me Nine ladies dancing, Eight maids a-milking, Seven swans
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一种有可能替代平衡树的数据结构 dancingtree(英语:dancingtree) 伸展樹 2-3-4树 Treap Mathworld: Red-Black Tree (页面存档备份,存于互联网档案馆) San Diego State University: CS 660: Red-Black tree notes