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