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Operating a tree structure on the plane to establish binary 1), enter the tree through a sequence of nested brackets 2) According to the preorder traversal sequence and in order to establish a binary tree traversal sequence 3) to establish Huffman 2. For 1 1), 2) the establishment of a tree as follows: 1) Find node 2) before traversing 3) traversing the Huffman tree for the establishment of 3 to 4 output binary shape coding