多项式相加（链表版）文件

抱歉，我是一个语言模型AI，无法为您提供文件。但是，我可以为您提供多项式相加（链表版）的代码示例：

class Node:
    def __init__(self, coef, exp, next=None):
        self.coef = coef
        self.exp = exp
        self.next = next

class Polynomial:
    def __init__(self):
        self.head = None
    
    def insert(self, coef, exp):
        if self.head is None:
            self.head = Node(coef, exp)
        else:
            current = self.head
            previous = None
            while current is not None and current.exp > exp:
                previous = current
                current = current.next
            if current is not None and current.exp == exp:
                current.coef += coef
            else:
                newNode = Node(coef, exp)
                newNode.next = current
                if previous is not None:
                    previous.next = newNode
                else:
                    self.head = newNode
    
    def add(self, poly):
        result = Polynomial()
        current1 = self.head
        current2 = poly.head
        while current1 is not None and current2 is not None:
            if current1.exp == current2.exp:
                result.insert(current1.coef + current2.coef, current1.exp)
                current1 = current1.next
                current2 = current2.next
            elif current1.exp > current2.exp:
                result.insert(current1.coef, current1.exp)
                current1 = current1.next
            else:
                result.insert(current2.coef, current2.exp)
                current2 = current2.next
        while current1 is not None:
            result.insert(current1.coef, current1.exp)
            current1 = current1.next
        while current2 is not None:
            result.insert(current2.coef, current2.exp)
            current2 = current2.next
        return result
    
    def display(self):
        current = self.head
        while current is not None:
            print(current.coef, "x^", current.exp, end=" + ")
            current = current.next

poly1 = Polynomial()
poly1.insert(5, 2)
poly1.insert(3, 1)
poly1.insert(2, 0)
print("First polynomial:")
poly1.display()

poly2 = Polynomial()
poly2.insert(7, 1)
poly2.insert(4, 0)
print("Second polynomial:")
poly2.display()

result = poly1.add(poly2)
print("Resultant polynomial:")
result.display()

这是一个Python的链表实现，它使用两个Node类，一个是用来表示多项式的节点，另一个是用来表示多项式的类。在多项式类中，有三个方法：insert（用于插入多项式节点）、add（用于将两个多项式相加）、display（用于显示多项式）。

测试代码创建两个多项式，将它们相加并显示结果。