数算的二叉树的POJ作业，分别有：二叉树1_二叉树的操作；二叉树2_文本二叉树；二叉树3_由中根序列和后根序列重建二叉树；二叉树4_表达式.表达式树.表达式求值；二叉树5_Huffman编码树；二叉树6_二叉搜索树；二叉树7_实现堆结构-Count of the binary tree POJ jobs

一、约瑟夫循环问题；二、一元多项式的运算；三、逆波兰表达式求值；四、杨辉三角显示；五、四则运算表达式求值；六、BST二叉树-First, Joseph circulation problems Second, one yuan polynomial arithmetic Third, reverse Polish expression evaluation Fourth, Pascal' s Triangle Show five, four arithmetic expressio

运用二叉树求表达式值 根据表达式 构建二叉树 建立波兰式 求出值。(Using the two tree to calculate the expression value, construct two fork tree according to the expression, and establish the Poland type value.)