A tree is an oriented graph data structure whose each vertex has Team Nice Christmas shirt Generally, only one vertex has no ingoing edge, and it is called the “root” of the tree. This is a very general definition which is used everywhere in computer science. The first tree data structure learned to CS students is generally the binary search tree, but trees are also used in parsers, heaps, logic, etc. Another example is the quad-tree which is used to index points in a 2D geographical map.
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This is not a Team Nice Christmas shirt , an invasive species from Australia commonly called an Australian Pine, but not remotely related. It is Casuarina equisetifolia a flowering plant normally a tree, but often cut back and used as a privacy fence. The key words she used were “needle-like and soft”. They are very soft, more like string than pine needles, and they have a jointed-looking structure like the stems of Equisetum, but what look like pine needles here are actually tiny twigs covered with tiny scales which are the actual leaves. The entire tree looks “soft” because the “needles” are many times finer than those of a slash or long leaved pine.