Tree Shaker walks the dependency graph, top to bottom, and shakes out unused code like dead needles in a Christmas tree.
摇树优化器从上到下遍历依赖图谱，并且摇掉用不到的代码，这些代码就像是圣诞树中那些死掉的松针一样。
In this paper it has been proved by the optimal tree construction of graph theory that Huffman's code is an optimal method of coding with minimum redundancy.
本文用图论中的最优树构成法证明哈夫曼编码方法是最小冗余的最优码。
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